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1.
Acta sci., Biol. sci ; 42: e48871, fev. 2020. map, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1460964

Resumo

Fish fauna was studied in five sites of the shallow infralittoral of the Paranaguá Bay during the period from October 1999 to September 2000. At each sampling site, fish were sampled with other trawls, salinity and temperature were measured, water samples were taken from the bottom of the water column for determination of dissolved oxygen, dissolved inorganic nitrogen and phosphate. The spatial and temporal behavior of the environmental variables was analyzed by a Principal Component Analysis; Cluster Analysis was used to gather the sampling sites, and Factorial Correspondence Analysis was applied to the most abundant species. Temperature was themost important variable for the distribution of the months, allowing the division of the study period into hot and cold months. The temporal variation in the fish fauna composition was indicated by cluster analysis, with highest percentages of dissimilarity between the sampling sites during hot months. The variation in dissimilarity between the sites occurred due to differences in the number of individuals and species of the catches. The high frequencies of occurrence of Anisotremus surinamensis, Etropus crossotus, Genidens genidens, Micropogonias furnieri and Sphoeroides greeleyiwere related to high temperatures. The greatest number of fish and species observed in hot months may be related to the life cycle of many species, which reproduce in warmer months, and whose offspring use estuaries as breeding areas.


Assuntos
Animais , Análise Fatorial , Estuários , Peixes
2.
Bol. Inst. Pesca (Impr.) ; 24: 65-71, 1997.
Artigo em Português | LILACS-Express | VETINDEX | ID: biblio-1464531

Resumo

The purpose of this research is the evaluation of the growth of Loricariichthys anus from the Emboaba Lagoon, Rio Grande do Sul, Brazil. The mathematical model used was the von Bertalnffy's one (1938). The growth curves had their parameters estimated through the method of annual rings observed in otoliths and vertebra. This study showed the positive allometric growth and sexual dimorphism in relation to the growth curves. The females are significantly larger than the males, however the males reach their asymptotic length more rapidly.


O objetivo do trabalho é estudar o crescimento de Loricariichthys anus na lagoa Emboaba, Rio Grande do Sul, Brasil. O modelo empregado foi o de von Bertalanffy (1938), sendo suas constantes estimadas pelo método dos anéis etários em otólitos e vértebras. Ficou evidenciado o crescimento alométrico positivo dos indivíduos e o dimorfismo sexual quanto às curvas de crescimento. As fêmeas são significativamente maiores que os machos, que, por sua vez, apresentam um crescimento mais acelerado.

3.
B. Inst. Pesca ; 24: 65-71, 1997.
Artigo em Português | VETINDEX | ID: vti-761247

Resumo

The purpose of this research is the evaluation of the growth of Loricariichthys anus from the Emboaba Lagoon, Rio Grande do Sul, Brazil. The mathematical model used was the von Bertalnffy's one (1938). The growth curves had their parameters estimated through the method of annual rings observed in otoliths and vertebra. This study showed the positive allometric growth and sexual dimorphism in relation to the growth curves. The females are significantly larger than the males, however the males reach their asymptotic length more rapidly.


O objetivo do trabalho é estudar o crescimento de Loricariichthys anus na lagoa Emboaba, Rio Grande do Sul, Brasil. O modelo empregado foi o de von Bertalanffy (1938), sendo suas constantes estimadas pelo método dos anéis etários em otólitos e vértebras. Ficou evidenciado o crescimento alométrico positivo dos indivíduos e o dimorfismo sexual quanto às curvas de crescimento. As fêmeas são significativamente maiores que os machos, que, por sua vez, apresentam um crescimento mais acelerado.

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