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1.
Braz. j. biol ; 83: e250003, 2023. tab, graf
Artigo em Inglês | MEDLINE, LILACS, VETINDEX | ID: biblio-1339392

RESUMO

Abstract This study estimated the length-weight relationships of 16 fish species occurring close to the shores of sandy beaches along the lower Negro River basin, Brazilian Amazon. The specimens were captured for one day each month, in October to November 2016, early in the morning and early evening, using trawl net (20 m taken for standard length (SL - 0.1 cm precision) and total weight (TW - 0.01 g precision). The parameters a and b of the equation WT = a.LTb were estimated. The a values ranged from 0.0018 to 0.0226 and b values ranged from 2.5271 to 3.3244. This study also provides new data on of maximum lengths for six species, Amazonsprattus scintilla, Brycon pesu, Moenkhausia megalops, Pachyurus paucirastrus, Reganella depressa and Trachydoras microstomus, and new reports of the LWRs parameters of 15 fish species.


Resumo Este estudo estimou as relações comprimento-peso de 16 espécies de peixes que ocorrem às margens de praias arenosas ao longo da bacia do baixo Rio Negro, Amazônia brasileira. As espécies foram capturadas durante um dia de cada mês, de outubro a novembro de 2016, no início da manhã e no início da noite, usando rede de cerco (20 m de comprimento e 3,5 m de altura, 5 malha mm entre nós opostos). As medidas foram feitas para comprimento padrão (SL - precisão de 0,1 cm) e peso total (TW - precisão de 0,01 g). Os parâmetros a e b da equação WT = a.LTb foram estimados. Os valores de a variaram de 0,0018 a 0,0226 e os valores de b variaram de 2,5271 a 3,3244. Este estudo também fornece novos dados sobre comprimentos máximos para seis espécies, Amazonsprattus scintilla, Brycon pesu, Moenkhausia megalops, Pachyurus paucirastrus, Reganella depressa e Trachydoras microstomus, e novos reportes dos parâmetros da LWRs de 15 espécies de peixes.


Assuntos
Animais , Perciformes , Caraciformes , Characidae , Brasil , Rios
2.
Braz. j. biol ; 83: e246180, 2023. tab, graf
Artigo em Inglês | MEDLINE, LILACS, VETINDEX | ID: biblio-1278550

RESUMO

Abstract In fisheries, the phenomenon known as fishing down food webs is supposed to be a consequence of overfishing, which would be reflected in a reduction in the trophic level of landings. In such scenarios, the resilience of carnivorous, top predator species is particularly affected, making these resources the first to be depleted. The Serra Spanish mackerel, Scomberomorus brasiliensis, exemplifies a predator resource historically targeted by artisanal fisheries on the Brazilian coast. The present work analyzes landings in three periods within a 50-year timescale on the Parana coast, Southern Brazil, aiming to evaluate whether historical production has supposedly declined. Simultaneously, the diet was analyzed to confirm carnivorous habits and evaluate the trophic level in this region. Surprisingly, the results show that from the 1970's to 2019 Serra Spanish mackerel production grew relatively to other resources, as well as in individual values. The trophic level was calculated as 4.238, similar to other Scomberomorus species, consisting of a case where landings increase over time, despite the high trophic level and large body size of the resource. The results agree with a recent global assessment that has demystified a necessary correlation between high trophic level and overexploitation, but possible factors acting on the present findings are discussed.


Resumo Na pesca, o fenômeno fishing down food webs, ou 'pescando teias tróficas abaixo', expressa a redução do nível trófico na composição das capturas, e tem origem tradicionalmente atribuída à sobrepesca. Sob intenso extrativismo, a resiliência das espécies carnívoras, predadoras de topo, é particularmente afetada, sendo seus estoques os primeiros a entrarem em depleção. A cavala, ou serra, ou sororoca, Scomberomorus brasiliensis, é exemplo de recurso predador historicamente alvo da pesca artesanal, de pequena escala, na costa brasileira. O presente trabalho analisa os valores de desembarque do recurso em três períodos ao longo de 50 anos na costa paranaense, sul do Brasil, com objetivo de avaliar se sua produção tem efetivamente diminuído. Ainda, estuda-se a dieta da espécie na região, para confirmar seus hábitos carnívoros e avaliar o nível trófico na região. Os resultados mostram que, surpreendentemente, dos anos 1970 para 2019 a produção de S. brasiliensis tem aumentado em valores absolutos, bem como relativamente à de outros recursos, em que pese o nível trófico 4,238, similar a outras espécies do gênero. Constata-se que a pesca da cavala na região de estudo constitui um caso de aumento nos desembarques a despeito de elevado nível trófico e grande tamanho corpóreo. Os resultados concordam com recente levantamento em nível mundial, que nega existir correlação necessária entre sobrepesca e nível trófico alto, mas fatores que podem explicar os resultados do presente trabalho são discutidos.


Assuntos
Animais , Perciformes , Pesqueiros , Brasil , Conservação dos Recursos Naturais , Cadeia Alimentar
3.
Biol Lett ; 18(5): 20210658, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35506239

RESUMO

Locomotion dominates animal energy budgets, and selection should favour behaviours that minimize transportation costs. Recent fieldwork has altered our understanding of the preferred modes of locomotion in fishes. For instance, bluegill employ a sustainable intermittent swimming form with 2-3 tail beats alternating with short glides. Volitional swimming studies in the laboratory with bluegill suggest that the propulsive phase reflects a fixed-gear constraint on body-caudal-fin activity. Largemouth bass (Micropterus salmoides) also reportedly display intermittent swimming in the field. We examined swimming by bass in a static tank to quantify the parameters of volitional locomotion, including tailbeat frequency and glide duration, across a range of swimming speeds. We found that tailbeat frequency was not related to speed at low swimming speeds. Instead, speed was a function of glide duration between propulsive events, with glide duration decreasing as speed increased. The propulsive Strouhal number remained within the range that maximizes propulsive efficiency. We used muscle mechanics experiments to simulate power production by muscle operating under intermittent versus steady conditions. Workloop data suggest that intermittent activity allows fish to swim efficiently and avoid the drag-induced greater energetic cost of continuous swimming. The results offer support for a new perspective on fish locomotion: intermittent swimming is crucial to aerobic swimming energetics.


Assuntos
Bass , Perciformes , Animais , Bass/fisiologia , Músculos , Perciformes/fisiologia , Natação/fisiologia
4.
Artigo em Inglês | MEDLINE | ID: mdl-35544312

RESUMO

An actinobacterium, designated strain EGI L10124T, was isolated from saline lake sediment collected in Xinjiang province, PR China. The taxonomic position of the isolate was determined based on polyphasic taxonomic and phylogenomic analyses. Phylogenetic analysis and 16S rRNA gene sequence similarities indicated that strain EGI L10124T formed a distinct clade with Rhabdothermincola sediminis SYSU G02662T, with a shared sequence identity of 95.2 %. The novel isolate could be distinguished from species in the genus Rhabdothermincola by its distinct phenotypic, physiological and genotypic characteristics. The cells of strain EGI L10124T were aerobic, Gram-stain-positive and short rod-shaped. Optimal growth conditions of strain EGI L10124T on marine agar 2216 were registered at pH 8.0 at 37 °C. In addition, meso-diaminopimelic acid was the diagnostic diamino acid in the cell-wall peptidoglycan. The major respiratory quinone was MK-9 (H8), while the major fatty acids were iso-C16 : 0, C17 : 0 and C16 : 0. The polar lipids included diphosphatidylglycerol, phosphatidylinositol mannoside and phosphatidylinositol. Based on the genome sequence of strain EGI L10124T, it appears that the G+C content of the novel isolate was 71.8 mol%. According to our data, strain EGI L10124T represents a new species of the genus Rhabdothermincola, for which the name Rhabdothermincola salaria sp. nov. is proposed. The type strain of the proposed novel isolate is EGI L10124T (=CGMCC 1.19113T=KCTC 49679T).


Assuntos
Actinobacteria , Perciformes , Animais , Técnicas de Tipagem Bacteriana , Composição de Bases , China , DNA Bacteriano/genética , Ácidos Graxos/química , Lagos , Fosfolipídeos/química , Filogenia , RNA Ribossômico 16S/genética , Análise de Sequência de DNA
5.
Ying Yong Sheng Tai Xue Bao ; 33(4): 1137-1144, 2022 Apr.
Artigo em Chinês | MEDLINE | ID: mdl-35543070

RESUMO

As the most important domestic fish in the Antarctic Ocean, Antarctic toothfish (Dissostichus mawsoni) has an important ecological role and high commercial value. The otolith morphology of fish species differs across stages of life history. Therefore, otolith shape analysis can be used to infer life history of D. mawsoni. In this study, otoliths from 120 D. mawsoni individuals with four life stages randomly collected from the Ross Sea, Amundsen Sea, Weddell Sea and Lazarev Sea were used to analyze the otolith morphological differences of D. mawsoni at life stages by conventional measurement and elliptical Fourier analysis. The results showed that variation in otolith morphology occurred across life stages. Generally, the morphology of otolith was changed from smooth and low comple-xity to zigzagging and high complexity. The growth rate of otolith along the longitudinal direction was lower than that along the transverse direction. The characteristic parts of otolith, such as antirostrum, changed significantly across life stages. Compared to the linear discriminant analysis (71.9%), the elliptical Fourier analysis had the higher discrimination rate (85.4%), indicating that the elliptical Fourier analysis was more suitable to analyze the otolith morphology of D. mawsoni.


Assuntos
Membrana dos Otólitos , Perciformes , Animais , Regiões Antárticas , Peixes
6.
Int J Biol Macromol ; 207: 850-858, 2022 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-35364191

RESUMO

It is generally accepted that Astragalus polysaccharides (APS) supplementation can makes beneficial effects to fish. However, the adverse effects of APS to fish remains poorly understood. In the present study, Asian seabass Lates calcarifer were studied to assess the influence of different doses of APS on growth, health and resistance to Vibrio harveyi. Results showed that supplemental APS with 0.10 to 0.20% significantly boosted the growth performance, the protease and lipase activities of L. calcarifer. Compared with control diet, the villus length of L. calcarifer fed with APS supplemented diets was significantly higher. L. calcarifer fed with APS supplementation diets also significantly facilitated the antioxidant capacity and immune function. Meanwhile, supplemental APS with 0.10 to 0.15% significantly promoted liver health by up-regulating the expression of anti-inflammatory cytokines and down-regulating the expression of pro-inflammatory cytokines. Furthermore, survival rate of L. calcarifer challenged with V. harveyi was higher in diets supplemented with APS compared to the control. However, 0.20% APS significantly hindered the growth performance and caused immunostimulatory fatigue in L. calcarifer compared to 0.10% APS. Taken together, the present study demonstrates that supplementation APS with 0.10% is the optimal level for promoting the growth performance, health and resistance to V. harveyi of L. calcarifer, while 0.20% APS exerts adverse effects on L. calcarifer. Our findings provide novel recommendations for the application of APS supplementation in farmed fish.


Assuntos
Astrágalo (Planta) , Doenças dos Peixes , Perciformes , Vibrio , Ração Animal/análise , Animais , Citocinas , Carboidratos da Dieta , Suplementos Nutricionais , Peixes , Polissacarídeos/farmacologia
7.
Artigo em Inglês | MEDLINE | ID: mdl-35442881

RESUMO

A novel species of Campylobacter was isolated from bile samples of chickens with spotty liver disease in Australia, making it the second novel species isolated from chickens with the disease, after Campylobacter hepaticus was isolated and described in 2016. Six independently derived isolates were obtained. They were Gram-stain-negative, microaerobic, catalase-positive, oxidase-positive and urease-negative. Unlike most other species of the genus Campylobacter, more than half of the tested strains of this novel species hydrolysed hippurate and most of them could not reduce nitrate. Distinct from C. hepaticus, many of the isolates were sensitive to 2,3,5-triphenyltetrazolium chloride (0.04%) and metronidazole (4 mg ml-1), and all strains were sensitive to nalidixic acid. Phylogenetic analysis using 16S rRNA and hsp60 gene sequences demonstrated that the strains formed a robust clade that was clearly distinct from recognized Campylobacter species. Whole genome sequence analysis of the strains showed that the average nucleotide identity and the genome blast distance phylogeny values compared to other Campylobacter species were less than 86 and 66%, respectively, which are below the cut-off values generally recognized for isolates of the same species. The genome of the novel species has a DNA G+C content of 30.6 mol%, while that of C. hepaticus is 27.9 mol%. Electron microscopy showed that the cells were spiral-shaped, with bipolar unsheathed flagella. The protein spectra generated from matrix-assisted laser desorption/ionization time of flight analysis demonstrated that they are different from the most closely related Campylobacter species. These data indicate that the isolates belong to a novel Campylobacter species, for which the name Campylobacter bilis sp. nov. is proposed. The type strain is VicNov18T (=ATCC TSD-231T=NCTC 14611T).


Assuntos
Campylobacter , Hepatopatias , Perciformes , Animais , Técnicas de Tipagem Bacteriana , Composição de Bases , Galinhas , DNA Bacteriano/genética , Ácidos Graxos/química , Hepatopatias/veterinária , Filogenia , RNA Ribossômico 16S/genética , Análise de Sequência de DNA
8.
J Exp Biol ; 225(9)2022 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-35403681

RESUMO

Fish perform rapid escape responses to avoid sudden predatory attacks. During escape responses, fish bend their bodies into a C-shape and quickly turn away from the predator and accelerate. The escape trajectory is determined by the initial turn (stage 1) and a contralateral bend (stage 2). Previous studies have used a single threat or model predator as a stimulus. In nature, however, multiple predators may attack from different directions simultaneously or in close succession. It is unknown whether fish are able to change the course of their escape response when startled by multiple stimuli at various time intervals. Pacific staghorn sculpin (Leptocottus armatus) were startled with a left and right visual stimulus in close succession. By varying the timing of the second stimulus, we were able to determine when and how a second stimulus could affect the escape response direction. Four treatments were used: a single visual stimulus (control); or two stimuli coming from opposite sides separated by a 0 ms (simultaneous treatment), 33 ms or 83 ms time interval. The 33 ms and 83 ms time intervals were chosen to occur either side of a predicted 60 ms visual escape latency (i.e. during stage 1). The 0 ms and 33 ms treatments influenced both the escape trajectory and the stage 1 turning angle, compared with a single stimulation, whereas the 83 ms treatment had no effect on the escape trajectory. We conclude that Pacific staghorn sculpin can modulate their escape trajectory only between stimulation and the onset of the response, but the escape trajectory cannot be modulated after the body motion has started.


Assuntos
Perciformes , Animais , Reação de Fuga/fisiologia , Peixes , Perciformes/fisiologia , Comportamento Predatório
9.
J Therm Biol ; 105: 103207, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35393048

RESUMO

The present study investigates the effects of water temperature under prolonged feed deprivation on meagre's (Argyrosomus regius) antioxidant defense system and apoptotic pathway. Therefore, triplicate groups of fish were subjected to 4 water temperatures (17, 20, 23, 26 °C) and deprived of feed for 60 days. Heat shock response (HSR) indicators (Hsp70 and Hsp90), activation of MAPK family members, uniquitination, antioxidant enzymatic activities of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR), and apoptotic indicators such as caspases levels and the ratio of Bax/Bcl-2 were determined in liver and muscle samples that were collected on days 0, 14, 41 and 60. Long term feed deprivation and temperature variations resulted in granulomatosis, HSR induction, MAPK activation, ubiquitination, and triggering of the antioxidant defense and apoptotic machinery of the meagre. Although these responses were differentially expressed at each different imposed temperatures, the most significant variations were mainly observed below 20 °C and above 23 °C. Correlation analysis showed a significant relation between the examined indicators. Thus, the obtained data herein indicated that long term food deprivation induces oxidative stress in fish.


Assuntos
Antioxidantes , Perciformes , Animais , Antioxidantes/metabolismo , Peixes/metabolismo , Estresse Oxidativo , Perciformes/fisiologia , Superóxido Dismutase/metabolismo , Temperatura , Água
11.
Zootaxa ; 5093(2): 101-141, 2022 Jan 26.
Artigo em Inglês | MEDLINE | ID: mdl-35390813

RESUMO

The hamlets (Hypoplectrus spp., Perciformes: Serranidae) constitute a distinctive model system for the study of a variety of ecological and evolutionary processes including the evolution and maintenance of simultaneous hermaphroditism and egg trading, sex allocation, sexual selection, social-trap, mimicry, dispersal, speciation, and adaptive radiation. Addressing such fundamental and complex processes requires a good knowledge of the taxonomy and natural history of the hamlets. Here, we review the taxonomy of the hamlets, from early ichthyological studies to the most recent species description in 2018. We report a total of 72 different binomial names for Hypoplectrus, synonymized or invalidated down to 17 unambiguously recognized species today. In addition, we redescribe Hypoplectrus affinis (Poey, 1861) as a valid species. In Bocas del Toro (Panama), this hamlet is distinct from eight sympatric congeners in terms of colour pattern, body size and behaviour. Whole-genome analysis and spawning observations indicate that it is genetically distinct from sympatric congeners and reproductively isolated through assortative pairing. Based on the colour pattern we detail in its redescription, live-fish photographs, videos, and earlier reports, H. affinis occurs in Panama, Nicaragua, Mexico, the Florida Keys, Cuba, Grand Cayman, Jamaica, the Dominican Republic, Los Roques (Venezuela), Bonaire, and Tobago. We conclude with a discussion of pending taxonomic issues in this group and the species status of the hamlets in general.


Assuntos
Bass , Perciformes , Animais , Genoma , Perciformes/genética , Simpatria
12.
Zootaxa ; 5104(1): 111-124, 2022 Feb 24.
Artigo em Inglês | MEDLINE | ID: mdl-35391047

RESUMO

The genus Physiculus is widespread in the Indo-Pacific with more than 32 valid species, and about 12 species were recorded only from the Indian Ocean. Two new species similar to each other are collected from the outer reef drop off of Kavaratti Island, Lakshadweep, India, Arabian Sea and described. Physiculus indicus sp. nov. is characterised by its light organ situated at about the middle of pelvic-fin base and anus, a small light organ, a rather forward situated anus, no scales on the gular region, dorsal-fin rays 89+5660, anal-fin rays 5560, and 52 vertebrae. This species differs from nearest congeners in lacking gular scales, anus situated closer to the light organ and slightly fewer total vertebrae. Physiculus lakshadeepa sp. nov. is characterised by a relatively high first dorsal fin (51.762.8% HL) and a light organ situated at the middle of the pelvic-fin base and anus. It has a small light organ, a rather forward situated anus, no scales on the gular region, dorsal-fin rays 89+5159, anal-fin rays 5359, and 49 vertebrae. Physiculus lakshadeepa differs from the nearest congeners in lacking gular scales, fewer anal-fin rays and fewer total vertebrae.


Assuntos
Gadiformes , Perciformes , Animais , Peixes , Índia
13.
Zootaxa ; 5092(2): 176-190, 2022 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-35391213

RESUMO

The Indian jellynose fish Ateleopus indicus Alcock 1891 is redescribed as a member of the genus Parateleopus based on examination of the holotype and 11 other specimens. The character states of small mouth, no sharp spine on sphenotic, and relatively short pelvic fin suggest that it belongs in the genus Parateleopus Smith Radcliffe 1912. Comments on its generic status and comparisons with all genera of the family Ateleopodidae are provided. The species is distinguished from Parateleopus microstomus, the sole congener, by 810 dorsal-fin rays as compared with three rays in P. microstomus.


Assuntos
Linguado , Perciformes , Animais , Peixes
14.
Zootaxa ; 5092(1): 127-133, 2022 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-35391217

RESUMO

Two specimens of Parapercis moki Ho Johnson were collected recently and detailed descriptions of their morphology and fresh coloration are provided. Its diagnosis is now revised as: band across head, six transverse bands on body and blade-like bar below eye; numerous small pores connected by canals forming about 910 vertical rows on cheek, opercle, and subopercle; scales on nape extending anteriorly to level of posterior margin of eyes; large spine on posteroventral corner of subopercle; very narrow interorbital space (1.72.0% SL); 4 dorsal-fin spines, each spine progressively longer, last spine entirely connected by membrane to first dorsal-fin ray; four pairs of canine teeth anteriorly in lower jaw; and palatine teeth present, in two rows, and vomerine teeth stout, in two rows.


Assuntos
Perciformes , Animais , Olho , Peixes , Cabeça , Mandíbula , Perciformes/anatomia & histologia
15.
Zootaxa ; 5091(3): 429-442, 2022 Jan 14.
Artigo em Inglês | MEDLINE | ID: mdl-35391239

RESUMO

The new waspfish Ocosia dorsomaculata n. sp. (Tetrarogidae) is described, based on specimens from Australia (5) and New Caledonia (51). Although O. dorsomaculata and Ocosia apia Poss Eschmeyer 1975 both share modally XVI, 8 dorsal-fin rays with a long second dorsal-fin spine, and presence of supraocular, lateral lacrimal, and suborbital spines, the former has modally 13 pectoral-fin rays (vs. usually 12 in the latter), a lower modal count of total gill rakers (10 vs. 1618), greater upper-jaw length, greater third to sixth dorsal-fin spine lengths, the third dorsal-fin spine slightly shorter than the second dorsal-fin spine (vs. third spine markedly shorter than second spine), 1 or 2 prominent pale brown to dark brown blotches on the membrane between the fifth to eighth or sixth to ninth dorsal-fin spines (vs. 1 blotch on the membrane around the third dorsal-fin spine and 1 blotch on the membrane between the sixth to eighth dorsal-fin spines), and body with 1115 longitudinal pale brown to dark brown bars along lateral line (vs. irregular brown specks). A key to the species of Ocosia is given.


Assuntos
Antozoários , Perciformes , Animais , Peixes
16.
Zootaxa ; 5105(4): 501-538, 2022 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-35391289

RESUMO

The monocle bream Scolopsis vosmeri species complex is revised. Three species in the complex are recognized: Scolopsis vosmeri (Bloch, 1792), widespread in the Indo-West Pacific, from the northern Indian Ocean (Pakistan, western India, Sri Lanka, Bay of Bengal, and the Andaman Sea, but not recorded from the Red Sea or Arabian Gulf, east African coast or Madagascar) to western Indonesia and Borneo; S. japonica (Bloch, 1793), restricted to the western Pacific Ocean from western Indonesia and north-western Australia east to the Philippines and north to southern Japan; and S. curite Cuvier, 1815, widespread from the western to the eastern Indian Ocean, including the Red Sea and Arabian Gulf. All three species are similar morphologically, and have been confused taxonomically, but phylogenetic analysis of the COI barcoding region shows they are evolutionarily divergent. The three species are redescribed in detail and characters found to distinguish them. Scolopsis vosmeri is easily distinguished from S. japonica and S. curite in having a white band along the side of the body; having a black spot on most body scales (versus greenish yellow spot in S. japonica and S. curite); in lacking a distinct black spot (sometimes a small and faint spot present) on the upper pectoral-fin base (versus small black wedge-shaped spot present in S. japonica and S. curite); caudal peduncle whitish in live individuals (versus caudal peduncle usually yellowish in S. japonica and S. curite); and pelvic and anal fins crimson to orange-red (versus yellow in S. japonica and S. curite). Scolopsis japonica and S. curite are indistinguishable by color pattern but differ in the degree of spination on the preopercular margin. Neotypes are designated for Scolopsis japonica and S. curite. Nomenclatural problems, including validity of the genus Scolopsis, are discussed. We regard Scolopsis curite Cuvier, 1815 as a valid binomial name and thus the type species of Scolopsis Cuvier, 1814 by subsequent monotypy.


Assuntos
Perciformes , Animais , Peixes , Filogenia
17.
Zootaxa ; 5116(3): 393-409, 2022 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-35391328

RESUMO

A new sciaenid fish, Johnius sasakii sp. nov. from the East Malaysian coastal waters of Sabah and Sarawak, Borneo is described herein. Johnius sasakii sp. nov. can be separated from the close congeners, Johnius heterolepis and Johnius carouna by having less gill rakers on the lower limb of the first gill arch (mode number 9 vs. 10 for J. heterolepis; 11 for J. carouna). It can be distinguished from J. heterolepis with the higher modal number of gill rakers on the upper limb of first gill arch (5 vs. 4), shorter anal-fin base length (9% vs. 10% of SL) and first anal-fin ray length (1012% vs. 1213% of SL) respectively. Furthermore, J. sasakii sp. nov. can be further differentiated from J. carouna by its shorter second anal-fin spine length 710% SL (usually 810%) vs. 1114% SL (usually 1112%) and slightly deeper body depth 2529% SL (usually 2628%) vs. 2328% SL (usually 2426%). Meanwhile, J. sasakii sp. nov. can be easily differentiated from J. macrorhynus by a present of molariform teeth on inner rows of jaws and stumpy gill rakers. Johnius (Johnius) sasakii sp. nov. can be clearly distinguished from species of the subgenus J. (Johnieops) by the lack of enlarged outer row teeth on upper jaw. A Kimura 2-parameter genetic distance comparison of 450 bp sequences of mitochondrial 16S rRNA and 488 bp nuclear gene S7 showed that J. sasakii sp. nov. are highly differentiated from J. heterolepis (16S: 10.4%, S7: 5.8%), J. carouna (16S:19.3%, S7:8.4%); and J. macrorhynus (16S: 16.7%, S7: 8.1%) respectively. The study highlights that the genetic approach from mtDNA and nDNA can contribute to the confirmation of taxonomic status of sympatric species in genus Johnius.


Assuntos
Perciformes , Animais , Bornéu , Brânquias , Malásia , RNA Ribossômico 16S
18.
Zootaxa ; 5094(4): 595-600, 2022 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-35391433

RESUMO

A new species of Trimma is described from three specimens from deep reefs (91.4 m) at Uchelbeluu Reef, Palau, western Pacific Ocean. Trimma panemorfum n. sp. is characterized by a live colouration of a yellow to orange body with two light blue stripes, each with a ventral bar of the same colour from the anterior origin. The predorsal midline is scaled, opercular and cheek scales are absent, the middle 1213 pectoral-fin rays are branched, the fifth pelvic-fin ray has two dichotomous branch points (total of four branch tips), the bony interorbital is 3442% pupil width and does not extend ventrolaterally beyond the fifth papilla of row p, where the posterior interorbital trench is present as a slight groove or absent.


Assuntos
Perciformes , Distribuição Animal , Animais , Peixes , Oceano Pacífico , Palau
19.
Zootaxa ; 5094(1): 92-102, 2022 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-35391461

RESUMO

In the Pacific Ocean, the rare Bigeye Sand Tiger shark Odontaspis noronhai has only been recorded twice, once from its central and once from its eastern part. Here we report the first record of this species from the northwestern Pacific. This specimen measuring 312 cm total length (TL) was captured off northeastern Taiwan (2525N, 12410E) from a depth of 100 m (in waters over 2100 m deep) in mid-December 2019, and was retrieved on 27 December 2019 when landed in port. Photo of the fresh specimen along with morphometric and meristic data and DNA information are provided herein. Dentition of the specimen is different from all other specimens by having two cusplets on at least one side of cusps on most of the teeth (vs. only one cusplet per side), and lower total tooth count (29/29 vs. 3438/3746). This record documents an extended distribution (about 7864 km westward from the central Pacific Ocean), and provides strong evidence for the wide distribution and mesopelagic characteristic of this poorly known species.


Assuntos
Perciformes , Tubarões , Animais , Dentição
20.
Food Chem ; 387: 132833, 2022 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-35405555

RESUMO

The effects of GML (Glycerol monolaurate) supplementation with two level (0.5 and 1.0 g kg-1) on the productive performance and flesh quality of large yellow croaker (360 per group) were investigated during feeding (23,50-days) and fasting stage (23,70-days). The GML supplementation significantly increased body weight after 23-days and crude protein, inosinic acid, and yellowness after 50-days. Moreover, it increased hardness, springiness, and chewiness by increasing the collagen content, myofiber density, and decreasing myofiber diameter. The high GML supplementation increased the total free amino acids, delicate amino acids, monounsaturated fatty acids (MUFA), polyunsaturated fatty acids (n-3 PUFA), and EPA + DHA, whereas it decreased the content of saturated fatty acids/unsaturated fatty acids (SFA/UFA). During fasting, better body shape and color were shown were shown at high GML supplementation. Conclusively, high dose GML supplementation exerted promising effects on the productive performance and flesh quality of large yellow croaker.


Assuntos
Lauratos , Perciformes , Aminoácidos/metabolismo , Animais , Ácidos Graxos/metabolismo , Lauratos/metabolismo , Monoglicerídeos , Perciformes/metabolismo
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