文章摘要
不同动物饵料对YY超雄黄颡鱼性腺发育的影响
Effects of different animal baits on the gonad development of YY super-male yellow catfish
投稿时间:2019-03-16  修订日期:2019-05-29
DOI:
中文关键词: YY超雄黄颡鱼  水蚯蚓  性腺  雌性化
英文关键词: YY super-male yellow catfish  Tubificidae  gonad  feminization
基金项目:国家现代农业产业技术体系特色淡水鱼体系项目(CARS-46)
作者单位E-mail
熊阳 华中农业大学 xiongyang2018@163.com 
梅洁 华中农业大学 jmei@mail.hzau.edu.cn 
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中文摘要:
      黄颡鱼“全雄1号”新品种的出现极大推动了黄颡鱼产业的发展,其中YY超雄黄颡鱼的培育为生产全雄黄颡鱼最关键一步。但近年来,YY超雄黄颡鱼出现大量精卵巢共存的兼性性腺,阻碍了全雄黄颡鱼产业的发展。通过比较近10年YY超雄黄颡鱼的生产和养殖记录,发现仅近几年投喂过水蚯蚓的YY超雄黄颡鱼性腺出现问题。基于此,我们研究四组不同饵料(丰年虫、浮游动物、红虫和水蚯蚓)连续投喂YY黄颡鱼鱼苗20天(11-30日龄),选择60日龄测量统计各组YY超雄黄颡鱼的存活率、体长和体重。水蚯蚓组YY超雄黄颡鱼的体长和体重显著高于其他三组,丰年虫组YY超雄黄颡鱼存活率显著低于其他几组。解剖观察60日龄和1年龄YY黄颡鱼的性腺结构并统计1年龄YY超雄鱼的受精率;结果显示,水蚯蚓组YY超雄黄颡鱼的性腺有75%为兼性性腺(精巢和卵巢均存在),25%为无精小叶的精巢,且一年龄的YY黄颡鱼受精率仅36.70±4.05%并显著低于其他三组,而其余三组性腺发育和受精率均正常。为研究水蚯蚓引起YY黄颡鱼雌性化具体原因,我们测量四种不同动物饵料的雌二醇含量,发现雌二醇含量均较低,推测YY超雄黄颡鱼雌性化的原因可能是水蚯蚓富集的环境内分泌干扰物(EDCS)导致。因此,在YY超雄黄颡鱼大规格苗种培育过程中,早期应投喂浮游动物或红虫,不宜投喂水蚯蚓。
英文摘要:
      The emergence of novel variety “All-male NO.1” dramatically promoted the development of the yellow catfish industry, of which the cultivation of YY super-male was a critical step. Recently, YY super-male yellow catfish with intersexual gonad emerged largely, which hindered the development of yellow catfish industry. We only found the problem of gonad development in YY super-male breeding with tubificidae by checking the production and breeding records for nearly 10 years. Therefore, four different baits including Artemia salina, Zooplankton, Chironomus plumosus, Tubificidae were used to treat YY super-male for 20 days (11 to 30 days post hatching). The survival rate, body length, and body weight of each group were measured at 60 dph (day post-hatching). Tubificidae treatments significantly increased the body length and weight compared with other baits, and the survival rate of fish fed with Artemia salina was significantly lower than fish fed with the other three baits. In addition, we performed histology analysis on gonadal structure at 60 dph and 1 year old and statistics of fertilization rate at 1 year old. As a result, the fish group fed with Tubificidae displayed 75% intersexual gonad and 25% testis without Seminiferous lobule, and the fertilization rate was only 36.70±4.05%, which was significantly lower than the other groups. In order to study the reasons for the feminization of YY yellow catfish, we measured the estradiol content and found that the estradiol content was low in all four different animal baits. It is speculated that the feminization of YY super-male yellow catfish may be caused by the environmental endocrine disruptors (EDCS) enriched by Tubificidae. Therefore, zooplankton or Chironomus plumosus could be fed in the early stage of large-scale breeding of YY-supermale yellow catfish, whereas Tubificidae should not be fed.
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