丁鱥鱼人工繁殖及鱼苗培育技术

Artificial propagation and breeding technology for Tinca tinca Linnaeus

【目的】探讨丁鱥鱼人工繁殖及鱼苗培育技术,满足广大水产养殖户对丁鱥鱼苗的需求,为加快丁鱥鱼在广西的推广养殖奠定基础。【方法】2004年11月和2005年3月,两次引进丁鱥1龄鱼进行培育,2005年春挑选成熟鱼进行人工繁育。【结果】亲鱼经过半年强化培育,平均体重600g/尾以上,雌雄鱼性腺发育到第IV～V期;以促黄体生成素释放激素类似物(LRH-A2)和地欧酮(DOM)混合物催产,经11～13h的发情效应,均出现产卵行为;经人工孵化和鱼苗培育,第1批的人工孵化率最高,为85.0%,但由于采用池塘孵化,仔鱼遭受池塘敌害生物残食,培育失败;第2、3批的人工孵化率分别为59.3%和63.0%,采用小水泥池孵化,两批共孵化出仔鱼约93.9万尾,培育获得规格为3.0～5.0cm鱼苗64.8万尾。【结论】通过科学合理的亲鱼强化培育、药物催产、人工孵化及鱼苗培育,可以成功繁育获得丁鱥鱼苗,但繁育过程中要注意水温调控,当水温上升到20℃以上、最好稳定在23～27℃时,应及时安排生产,以利于提高丁鱥鱼苗数量和质量。

[Objective]The experiment was conducted to obtain the artificial propagation and fry breeding technology for Tinca tinea Linnaeus and meet the need of farmers to fry for accelerating the extension of Tinea tinca Linnaeus in Guangxi. [Method]In Nov., 2004, one year old winter fry fishes were introduced for breeding, and in Mar., 2005, the mature parent fish was selected for artificial propagation in spring. [Result]Through half-year intensified breeding, the average body weight of parent fish reached above 600 g/tail, and the gonad of female and male parents developed to Ⅳ-Ⅴ stage. As parturition by LRH-A2 and DOM, the parent fish had oviposition after 11-13 h of heating effects. The rate of 1^st batch of artificial inoculation was the highest （85.0%）, however, the breeding failed due to preying by larger enemies. The rate of 2^nd and 3^rd batch of inoculation was 59.3 and 63.0%, respectively, in water cement pit, and the inoculated fries attained 939 thousand tails, of which 648 thousand tails ranged from 3.0-5.0 em in length. [Conclusion]By adopting reasonable breed of parent fish, practicing drug aided parturition and artificial inoculation Tinca tiuca Linnaeus fry may be propagated successfully, however, it needs to regulate the water temperature. Stabilized temperature of 23-27℃ was found to promote the parturition in time and enhanced the quantity and quality of Tinca tinca Linnaeus fry.