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POLIKULTUR RAJUNGAN (Portunus pelagicus) DAN IKAN BARONANG (Siganus gutatus) DI TAMBAK Suharyanto Suharyanto
Jurnal Perikanan Universitas Gadjah Mada Vol 10, No 2 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfs.8883

Abstract

The aim of this experiment was to find out data and information of growth rate, survival rate and yield of swimming crabs (Portunus pelagicus) and rabbit fish (Siganus gutatus) which cultured together with different stocking density of rabbit fish in brackishwater ponds. Nine brackishwater ponds with the dimention of 100 m2 with 100 cm depth were used. Crablet of 17th of 7.2 + 0.2 mm charapace width and 0.05 + 0.02 g body weight were used in this research with stocking density of 300 ind/100 m2. During the rearing the crabs were fed trash fish (Sardinella sp) given of twice a days, dosage 5% of total body weight. Experiment was carried out on complete randomized design with treatments were stocking density of rabbit fish i.e. 20 ind/100m2 (A), 30 ind/100 m2 (B), and 40 ind/100m2 (C) with three replicates. The rabbit fish of length were 9.1 + 0,8 cm and weight of 15+ 0.6 g were used. The result showed that the growth of body length and weight and survival rate of swimming crabs and rabbit fish were not significantly different (P>0.05), but the yield of rabbit fish was significantly different (P<0.05).
PENGARUH PADAT TEBAR SELTER RUMPUT LAUT (Gracillaria sp) TERHADAP PERTUMBUHAN DAN SINTASAN RAJUNGAN (Portunus pelagicus) DI TAMBAK Suharyanto Suharyanto; Suwardi Tahe; Sulaeman Sulaeman
Jurnal Perikanan Universitas Gadjah Mada Vol 10, No 2 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfs.8911

Abstract

The aim of this experiment was to find out the suitable stocking density of sea weed as shelter to growth and survival rate of swimming crabs (Portunus pelagicus) reared in brackishwater ponds. The research was conducted in nine brackishwater ponds with the dimension of 250 m2 for 120 days. The treatments different stocking density of sea weed (Gracillaria sp.) as shelter were applied, namely A: 500 kg/ha, B: 750 kg/ha, and C: 1000 kg/ha, with three replicates, respectively. Crablet 9th with carapace width 5,2 + 0.2 mm and body weight 0.04 + 0.02 g were introduced into each experimental ponds with density of 3 individu/m2. The crabs were fed with trash fish 15% of body weight in the first month, and then decreased to 5% in following month, twice a day. The experiments were design as complately randomized design. The result showed that the shelter were significantly increased to the survival rate and yield of swimming crabs (P<0.05), but not to the growth of charapace width and body weight. The best of survival rate and yield was obtained on the density of shelter at sum 1000 kg/ha.
UPAYA PENURUNAN TINGKAT KANIBALISME RAJUNGAN (Portunus pelagicus) DENGAN PEMBERIAN SUPLEMEN TRIPTOFAN Suharyanto Suharyanto; Yani Aryati; Suwardi Tahe
Jurnal Perikanan Universitas Gadjah Mada Vol 10, No 1 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfs.8944

Abstract

The aim of this experiment was to find out the suitable dosage of tryptophan mixed in diet of trash fish were fed and to decrease canibalism levels of swimming crabs (Portunus pelagicus) reared in fiber glass tanks. The research was conducted in research station of Research Institute for Brackishwater Aquaculture Maranak, Maros South Sulawesi on 8th May to 8th June 2006. Twelve fiber glass tanks were used of this research and the dimention of 1 x 1 x 0.5 m. Crablet of 17th from hatchery were used to this research and the dimention of 7.2 + 0.2 mm width and 0.05 + 0.02 g body weight. Hundred crablets were spreaded on the each tanks. The treatments were applied of dosage of tryptophan were mixed in the trash fish (Sardinella sp) as much as (A): 0% of biomass total, (B): 0.5%, (C): 1.0% and (D): 1.5% of biomass total with three replicates respectively. Variables monitored growth of charapace width and body weigth, canibalism levels, survival rate of swimming crab and water quality. Experimental design used complate randomized design. During of rearing were fed trash fish (Sardinella sp) with frequency of three times a days of dosage 15% of total body weight. The result showed that the crablet fed the diet with additional 1.5% tryptophan had significantly lower (P<0.05) cannibalisms compared to the crablet feed the control diet. The crablet fed the diet with additional 1.5% tryptophan had significantly higher (P<0.05) survival rate compared to the crablet fed the control diet. However, there were not significantly different specific growth rate among the treaments. Based on this result that additional 1.5% tryptophan could be decrease cannibalisms of swimming crabs crablet during experiment.
Co-Authors Sulaeman Sulaeman Suwardi Tahe Yani Aryati