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Pembenihan Selektif Kerapu Bebek, Cromileptes altivelis Turunan ke-2 (F-2) Tridjoko, Tridjoko; Haryanti, Haryanti; Muzaki, Ahmad; Sutarmat, Tatam
Jurnal Perikanan Universitas Gadjah Mada Vol 11, No 2 (2009)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (34.127 KB) | DOI: 10.22146/jfs.4

Abstract

The aim of this experiment was to know the gonad development of humpback grouper Cromileptes altivelis F-2 progeny. The F-2 progeny fishes were produced from selective breeding and composed by Lot 1, Lot 2 and Lot 3. The fishes were reared in the cylinder concrete tanks containing 75 m³, 10 m³ water and floating cages. Fishes were fed with commercial dry pellet in addition with vitamin mix, vitamin C and vitamin E. The result indicated that the mature gonad female of F-2 grouper broodstocks have been achieved. The female broodstocks with 590 g weight produced oocytes with diameter more than 400 µm. Genetic analysis showed that grouper Lot 2 was homogenous, did not find any polymorphism among individual fish, however Lot 1 and Lot 3 still showed high heterozygocity as 0.18 and 0.58, respectively.
Kematian Ikan Kerapu Hibrida Cantik (Kerapu Macan >< Kerapu Batik) dan Cantang (Kerapu Macan >< Kerapu Kertang) di Keramba Jaring Apung di Teluk Kaping, Buleleng-Bali Akibat Infeksi Ektoparasit Mahardika, Ketut; Mastuti, Indah; Sutarmat, Tatam
Jurnal Masyarakat Akuakultur Indonesia Vol 3, No 1 (2019): In Press
Publisher : Masyarakat Akuakultur Indonesia

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Abstract

Several constraints in aquaculture are seasonal dependent especially for parasitic disease. Natural condition of aquatic environment are affecting pathogen and fish along season. This study observed parasitic infection causing mass mortality of hybrid grouper juveniles thruoghout the year. This study was conducted in floating net cage at Kaping Bay North Bali in 2016. The juveniles were stocked in May, July and August. Parasitic infection were observed in Juli-August. Two ectoparasite were found, they are gill worms (Pseudorhabdosynochus sp.) and sea leeches (Zeylanicobdella arugamensis). They caused appetite decreasing, swimming on the surface, dark body color, thiny body andt decreased the population about 44.9% - 47,53%. Gill worm infected the fish at the initial with intensity of 54-187 individu/gill, While sea leeches infected the fish later in August with intensity about 40-50 individu/fish. The record of water quality showed that temperature and salinity were increased in July. This conditions were coincide with seasonal change in 2016. This result suggested that seasonal change was unfavourable conditions for fish health moreover for stocking time. 
Co-Authors Ahmad Muzaki Haryanti Haryanti Ketut Mahardika Mastuti, Indah Tridjoko Tridjoko