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All Journal Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology)
Djadja Subardja Sjafei
Masyarakat Iktiologi Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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BIOLOGI REPRODUKSI IKAN PELANGI MERAH {Glossolepis incisus, Weber 1907) DI DANAU SENTANI [Reproductive biology of red rainbowfish (Glossolepis incisus Weber 1907) in Sentani Lake] Lisa Sofia Siby; M. F. Rahardjo; Djadja Subardja Sjafei
Jurnal Iktiologi Indonesia Vol 9 No 1 (2009): Juni 2009
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v9i1.201

Abstract

The aim of this study is to explain biology aspect of red rainbowfish that is reproductive biology [sex ratio, gonad maturity, fecundity, spawning season and length at first maturity (L50)]. This study was conducted in Sentani Lake during 5 months (December 2007-May 2008). Sex ratio was higher for female on January-February (1:3), gonad maturity and GSI was higher in station 1, 2, 3 and 6 at December. Fecundity ranges between 910-3122 eggs. Eggs diameter is 0,625-7,125 ^m and spawning pattern is partial spawner and iteroparous.
ASPEK REPRODUKSI IKAN KAPASAN (Gerres kapas Blkr, 1851, Fam. Gerreidae) DI PERAIRAN PANTAI MAYANGAN, JAWA BARAT [Reproductive aspect of silver biddy (Gerres kapas Blkr, 1851, Fam. Gerreidae) in Mayangan Coast, West Java] Djadja Subardja Sjafei; Dian Syaputra
Jurnal Iktiologi Indonesia Vol 9 No 1 (2009): Juni 2009
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v9i1.203

Abstract

This study was held as a fundamental management for silver biddy fish in Mayangan Coast, Subang, West Java, from June to November 2003. The main objective of the study was to determine the sex ratio, gonad maturity development, gonado somatic index, fecundity, and spawning pattern. The result showed that the sex ratio of male and female fish based on total fish and mature fish were unbalanced (1:3.06 and 1:9.26). Based on gonad maturity development it suggested that fish spawned in every month. The first size of maturity for male and female were 115 mm and 105 mm. GSI increased based on total length and gonad maturity development. The fecundity of silver biddy fish was ranged from 1.158 to 219.372 in eggs. Based on the oocyte diameter distribution from the mature fishes, the fish was indicated as total spawner.
PERKEMBANGAN KEMATANGAN GONAD DAN TIPE PEMIJAHAN IKAN SELAIS (Ompok hypophthalmus) DI RAWA BANJIRAN SUNGAI KAMPAR KIRI, RIAU [Development of gonad maturity and spawning pattern of Ompok hypophthalmus in floodplain of Kampar Kiri River, Riau] Djadja Subardja Sjafei; Charles P.H. Simanjuntak; M. F. Rahardjo
Jurnal Iktiologi Indonesia Vol 8 No 2 (2008): Desember 2008
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v8i2.292

Abstract

The main objective of the study was to determine gonad maturity development and spawning pattern of O. hypophthalmus in floodplain of Kampar Kiri River. Samples were collected from June to December 2006 on a monthly basis. Biological samples were collected from a total of 474 O. hypophthalmus of which 249. females and 224 males were confirmed by macroscopic and histological analysis. Five gonad maturity stages were described based on the macroscopic and histological analysis. The dynamics of oocyte development of O. hypophthalmus, indicated a synchronism of maturation. Oocyte diameter distribution suggested that this species could be grouped as total spawner and iteroparous species.
Co-Authors Charles Parningotan Haratua Simanjuntak Dian Syaputra Lisa Sofia Siby M. F. Rahardjo M. F. Rahardjo