Abstract

Scalloped spiny lobster (Panulirus homarus) is an export commodity with high economic value in Asian-Pacific markets. Addition of artificial shelter for spiny lobster grow out reduces cannibalism while addition of net in spiny lobster rearing tank can increase mobility space. This study aimed to determine the optimum of shelter net size on growth, survival rate and health of spiny lobster grow out. This study used completely randomized design with three treatments and three replications; analyzed by ANOVA. The rearing was conducted using 9 fiberglass tank 1000 liter in volume. This research used scalloped spiny lobster, with average body weight (BW) 8.56±1.23 g and total length (TL) 7.39±0.114 cm, in stocking density 50 lobster/tank. Three shelter net sizes as treatments, i.e.: A: shelter net size of 4 time of bottom area (4 m2), B: size of 2 time of bottom area (2 m2) and C: without net addition. Feeding were twice a day, with dry pellet 1% biomass/day and trash fish and mussel meat (2:1) 10% biomass/day. The sampling of survival rate, total length and body weight were conducted every 15 days; while total haemocyte (THC) and BRIX index on the end of experiment. For supporting data was observed of water quality parameters: salinity, temperature, pH, DO, nitrite and ammonia. The result show that the survival rate on experiment during 75 days rearing, was significant different (P<0.05) among treatments. The best survival rate was on treatment A (4 time of bottom area) with survival rate (93.94±2.62%), followed by treatment B (2 time of bottom area) (80.56±2.88%: and treatment C (without net addition) (68.78±4.67 %). The grow of body weight and total length show that highest on treatment B with body weight and total length in the end of experiment was 37.77±1.896 g and 10.30 ±0.361a cm; followed by treatment A (35.58±0.405 g and 10.15 ±0.146 cm) and lowest in C (35.34±2.061 g and 10.04 ±0.265 cm); but from statistic analyze not significant different among treatment (p>0.05). Addition for shelter net size of 4 time of bottom area net more suitable for scallop spiny lobster reared in fiberglass tank; because can increased the survival rate and reduced the cannibalism.

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