Biotechnique Identification of Breeding & Cultivation of rabbitfish ( Siganus sutor )Until 2.5 cm stage in Hormozgan province

Abstract

This project was conducted to determine The Bio technique of Reproduction and larvae Rearing of Rabbitfish ( siganus sutor ) till fingerling stage ( 2.5 centimeter TL) in Hormozgan province ( North of Persian Gulf ) during years 2010-2013 . preadults and adults were captured from coastal area of Bandar-e Lengeh and Lavan Island .The effects of synthetic hormones , LHRHa2 and HCG in variety days of reproduction season were surveyed . Fecundity, eggs diameter, fertility, Hatching, and survival rate were computed . Effects of salinity , light severity and tank size ( 30 L aquarium 300L poly ethylene tank and 2400 L fiber glass tank ) on survival rate were surveyed, although Breeding of fish e\were successful in years 2011 and 2012 but larvae were only reared in year 2012. Results revealed that , if hormone injection efforts fulfill during April 1st to may15th , Siganus sutor will surely spawn . Results revealed that average diameter of fertilized eggs was about 625.05 ±6.15 µ and there were 5570± 105 eggs in each gram According the results the rate of hatching and larvae survival was higher in 300L poly ethylene tank and 2400 L fiber glass tank than 30 L aquarium . The most mortality was observed during days 3-7 after hatch. There was not any difference between survival rate of larvae in various salinity .The best light situation for larvae was 2000 lux . under strong light , mortality of larvae increased. Growth of larvae was very slow in first 15 days after hatch but after that increased quickly .length of larvae in the first day was about 2.97±0.07 mm. on the day 45 , larvae gained the length of 3.56 ± 0.4 cm . According to the results , although, breeding , seed production , larvae rearing and broodstock suppling of siganus sutor is possible but more Research to diversify the live food wich is used to feed larvae and also to increase survival rate of larvae must be performe .