Reproduction cycle of Longtail shad (Tenualosa macrura) in Bengkalis Waters, Riau, Indonesia

Tenualosa macrura is an endangered fish in Riau Province, which is classified as a protected fish. Therefore, the first step is to study the reproductive cycle, aiming o prevent these species from extinction. The observation was carried out for 13 months from January 2019 to February 2020 (except February 2019) in Indonesia's Bengkalis waters. This study's purpose was to determine the spawning season, fecundity, and behavior of this species. The results showed that the relationship between length and weight positively correlates with the length-weight of male T. macrura (R² = 0.84) and female (R² = 0.67), while the length-weight of all males and females were reported to be (R² = 0.95). Meanwhile, the relationship between fecundity and length-weight has no relationship. Furthermore, the spawning season lasted throughout the year, and it occurred at every low tide (dark moon) and high tide (full moon). Despite being discovered occasionally in a limited amount, the greatest amount of T. macrura was reported between July and September each year.(AU)

Reproduction cycle of Longtail shad (Tenualosa macrura) in Bengkalis Waters, Riau, Indonesia

Tenualosa macrura is an endangered fish in Riau Province, which is classified as a protected fish. Therefore, the first step is to study the reproductive cycle, aiming o prevent these species from extinction. The observation was carried out for 13 months from January 2019 to February 2020 (except February 2019) in Indonesia's Bengkalis waters. This study's purpose was to determine the spawning season, fecundity, and behavior of this species. The results showed that the relationship between length and weight positively correlates with the length-weight of male T. macrura (R² = 0.84) and female (R² = 0.67), while the length-weight of all males and females were reported to be (R² = 0.95). Meanwhile, the relationship between fecundity and length-weight has no relationship. Furthermore, the spawning season lasted throughout the year, and it occurred at every low tide (dark moon) and high tide (full moon). Despite being discovered occasionally in a limited amount, the greatest amount of T. macrura was reported between July and September each year.

Analysis of reproduction and spawning season of glass catfish Ompokhypophthalmus (Bleeker): case in lakes in Buluh Cina Village, Riau,Indonesia

The purpose of this research was to determine the reproductive system and fish spawning season (Ompok hypophthalmus) in Pinang Luar and Pinang Dalam Lakes in Buluh Cina Village of Kampar. This research was conducted at Oxbow Lake of Buluh Cina Village and the Ecology Laboratory of the Faculty of Fisheries and Marine Sciences, University of Riau. Sampling collection of O. hypophthalmuswas carried out at Oxbow Lake (Pinang Dalam and Pinang Luar Lakes) of Buluh Cina from September to November 2016. Meanwhile, measurement of in situ water quality anddata retrieval was carried out only on September 14, 2016. O. hypophthalmus is estimated to experience spawning only oncea year. Spawning time or spawning of fish in November in 2016 was estimated to be exactly the time after the full moon in November before December. Glass catfish studied was not related to the rainy season which usually occurs in the same fish in the Kampar river, because that year coincided with the summer in those months. In recent years, there has been a lot of talk about global climate change which causes uncertain environmental and seasonal conditions. Erratic seasonalconditions have caused the rainy and dry seasons to be erratic. Every living creature, including fish, is strongly influenced byits environmental parameters, whether in the form of the season or the environmental conditions of its own environmental parameters. Although this research was onlycarried out in a short period of time, it was necessary to look at the influence of the environment on fish that was focusedon glass catfish (O. hypophthalmus) at Oxbow Lake of Buluh Cina Kampar Protected Forest.(AU)

Behavior and reproduction of belida fish (Notopterus notopterus, Pallas1769) in different stocking density and nurtured with different types offeed

Belida fish (Notopterus notopterus, Pallas 1769) is one of Indonesia's endemic fish that has high economic value so that the catch is so high and has begun to decline in population from nature. The purpose of this study was to analyze the behavior and reproduction of belida fish that nurtured with stocking density and different types of feed. This study was conducted from April to June 2018 in the Fish hatchery and Breeding Laboratory of Fisheries and Marine Science Faculty, Riau University. The design used is a randomized complete design with stocking density treatment consisting of 5, 10, and 15 tail/m³ and type of feed consisting of pellet + vitamin E feed and trash fish feed (dumbo catfish cubs). The results showed that the best treatment was in the stocking density of 5 tail/m³ and trash fish feed (dumbo catfish cubs) showed aggressive fish behavior in chasing the feed given, resulting in reproductive value consisting of the fish number of gonad maturity (TKG IV) as many as 5 fishes, gonado somatic index value of 0.58%, the fecundity of 6,053 eggs, egg diameter of 2.49 mm and semen volume of 0.045ml.(AU)

Analysis of reproduction and spawning season of glass catfish Ompokhypophthalmus (Bleeker): case in lakes in Buluh Cina Village, Riau,Indonesia

The purpose of this research was to determine the reproductive system and fish spawning season (Ompok hypophthalmus) in Pinang Luar and Pinang Dalam Lakes in Buluh Cina Village of Kampar. This research was conducted at Oxbow Lake of Buluh Cina Village and the Ecology Laboratory of the Faculty of Fisheries and Marine Sciences, University of Riau. Sampling collection of O. hypophthalmuswas carried out at Oxbow Lake (Pinang Dalam and Pinang Luar Lakes) of Buluh Cina from September to November 2016. Meanwhile, measurement of in situ water quality anddata retrieval was carried out only on September 14, 2016. O. hypophthalmus is estimated to experience spawning only oncea year. Spawning time or spawning of fish in November in 2016 was estimated to be exactly the time after the full moon in November before December. Glass catfish studied was not related to the rainy season which usually occurs in the same fish in the Kampar river, because that year coincided with the summer in those months. In recent years, there has been a lot of talk about global climate change which causes uncertain environmental and seasonal conditions. Erratic seasonalconditions have caused the rainy and dry seasons to be erratic. Every living creature, including fish, is strongly influenced byits environmental parameters, whether in the form of the season or the environmental conditions of its own environmental parameters. Although this research was onlycarried out in a short period of time, it was necessary to look at the influence of the environment on fish that was focusedon glass catfish (O. hypophthalmus) at Oxbow Lake of Buluh Cina Kampar Protected Forest.

Behavior and reproduction of belida fish (Notopterus notopterus, Pallas1769) in different stocking density and nurtured with different types offeed

Belida fish (Notopterus notopterus, Pallas 1769) is one of Indonesia's endemic fish that has high economic value so that the catch is so high and has begun to decline in population from nature. The purpose of this study was to analyze the behavior and reproduction of belida fish that nurtured with stocking density and different types of feed. This study was conducted from April to June 2018 in the Fish hatchery and Breeding Laboratory of Fisheries and Marine Science Faculty, Riau University. The design used is a randomized complete design with stocking density treatment consisting of 5, 10, and 15 tail/m³ and type of feed consisting of pellet + vitamin E feed and trash fish feed (dumbo catfish cubs). The results showed that the best treatment was in the stocking density of 5 tail/m³ and trash fish feed (dumbo catfish cubs) showed aggressive fish behavior in chasing the feed given, resulting in reproductive value consisting of the fish number of gonad maturity (TKG IV) as many as 5 fishes, gonado somatic index value of 0.58%, the fecundity of 6,053 eggs, egg diameter of 2.49 mm and semen volume of 0.045ml.