圆斑星鲽卵巢发育的组织学和数量形态特征研究

Histological and morphometric studies on the annual gonadal maturation cycle of spotted halibut Verasper variegatus

中文关键词: 圆斑星鲽  卵巢发育  组织学特征  数量形态特征

英文关键词: Verasper variegatus  Ovary development  Histological characters

中文摘要:

      研究了圆斑星鲽卵巢年周期发育的组织学规律及其数量形态特征变化。结果表明，圆斑星鲽产卵属1年1次成熟分批产卵类型，卵巢发育属非同步分批成熟类型。性成熟亲鱼在年周期发育中经历5个发育时期，同时可见5个发育时相的卵母细胞，不同发育时期的卵巢中卵母细胞类型和组成比例不同。性腺指数（GSI）、肝脏指数（HSI）和肥满度（CF）在亲鱼的年周期发育中呈现规律性的变化，与卵巢发育呈现密切的关联。亲鱼卵巢发育的有效积温为1 050日度。

英文摘要:

      The annual ovarian maturation cycle of spotted halibut Verasper variegatus was studied by employing light microscopy and morphometric methods. The spotted halibut features asynchronous oocyte development and batch spawnings. In sexually matured female, the oocyte growth consisted five phases, and the ovary maturation cycle consisted five stages accordingly. Gonadosomatic index (GSI), hepatosomatic index (HSI) and condition factor (CF) were all found to increase prior to, or during the peak phase of vitellogenic growth corresponding to the gonad development. The effective accumulated temperature for spotted halibut female broodstock is 1 050 d·℃. The results would highlight the reproductive cycle of captive female broodstocks of spotted halibut, and also serve as useful tools for broodstock breeding and determination of timing for hormone induced spawning.