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| Reproductive Performance of Female Schizothorax wangchiachii Farmed in Imitation Ecological Ponds |
| DENG Longjun |
| Yalong River Hydropower Development Company, Ltd, Chengdu 61000, China |
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Abstract A total of 1593 brooders (♀393, ♂1200) of Schizothorax wangchiachii were selected from a circular eco-culture pond, and reared in four and three 75 m2 (long 25 m × wide 3 m) flowing water ponds at a ratio of ♀1∶♂5, respectively. When the males and females were chasing each other, the mixture of luteinizing hormone-releasing hormone analogue A2 (LHRH-A2 16 μg/kg)+diethyl ketone maleic acid (DOM 5mg/kg)+chorionic gonadotropin (HCG 1400 IU/kg) was injected into the fish who were squeezed the female abdomen to obtain eggs every 6 h after 24 h by anesthetizing with 80 mg/L MS-222, artificial fertilization, dry insemination, and measured the body length, body weight, and age in 393 females and egg diameter of fertilized eggs, and the rates of fertilization, spawning success, and relative and absolute fecundity in order to study the reproductive performance of mature female S. wangchiachii in aquaculture. The results showed that the females had homometric growth and expressed as Von Bertalanffy equation as m=7.345×[1-e-0.092(t+2.733)]2.92, with the growth inflection age of 9.2 year old, body weight of 2.33 kg and body length of 54.5 cm, and the maximum body weight of 7.345 kg and body length of 80.5 cm. The female had the first sexual maturity at age of 4, with average egg diameter of (3.97±0.36) mm, with increase in relative and absolute fecundity as age, especially in the first three years of sexual maturity, and the average absolute fecundity of (1.71±0.84)×104 eggs and relative fecundity of (8.7±3.0) eggs/g. There were rapid increase in spawning success, fertilization, and relative fertilized egg amount since the first sexual maturity, with the maximal spawning success at 9 years old(81.7%), the maximal fertilization at 10 years old [(92.7±4.9)%], and the maximal relative fertilized egg amount at 10 years old [(8.1±2.6) eggs/g]. In conclusion, the best reproductive performance was found in 9—11 years old females, followed by 7—8 years old females, and the worst in 12—14 years old females, less than 7 years old females as broodstock, and elimination of more than 14 years old broodstock.
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Received: 31 May 2019
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