ความสมบูรณ์เพศของแม่ปลาสลิด Trichogaster pectoralis (Regan, 1910) ระยะแรกรุ่นและเทคนิคการเพาะพันธุ์ในเรือนเพาะฟัก

Abstract

Study on characteristics of early mature snakeskin gourami (Trichogaster pectoralis) female was performed by researching on fecundity, Gonadosomatic index , GSI) and the width of snakeskin gourami female abdomen which was increased during maturity. The result was that the average total length and the average weight of early mature female was 17.31± 0.55 centimeter (n=20) and 73.78± 7.18 g. Gonadosomatic index was 4.50±0.95%. The egg of the snakeskin gourami was pelagic, round and yellow. The breeding could be performed by injection of synthetic hormone to induce spawning at 30 microgram/ 1 Kg fish and the ratio of male to female was 1:1. The average egg diameter was 822 ± 4.58 millimeter (n=10,000), which was divided into 5 groups: group 1 (500-600 micrometer), group 2 (601-700 micrometer), group 3 (701-800 micrometer), group 4 (801-900 micrometer) and group 5 (901-1,000 micrometer) which were 0.10±0.28, 1.63±1.82 , 47.56±7.70, 40.28±5.91, 10.43±4.81 %, respectively. The average fecundity was 17,140±1,017 eggs. The extension of abdominal width was increased 85.31±25.04 % (n=20). Average spawning ratio was 60.09±45.97% at 27.0-30.5°C water temperature. This result can be applied for development of commercial snakeskin breeding.