Seasonal changes in the pituitary‐ gonad axis of feral goldfish, Carassius auratus L., from Ontario, Canada
Seasonal changes in the pituitary‐ gonad axis of feral goldfish, Carassius auratus L., from Ontario, Canada
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加拿大安大略省野生金鱼 Carassius auratus L. 垂体-性腺轴的季节性变化
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
J. Leatherland
中科院分区：
文献类型：
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作者：
K. Munkittrick;J. Leatherland
1981年3月至11月和1982年4月，在安大略省剑桥市的一个池塘里采集到了看似健康的野生金鱼Carassius auratus L.根据组织学检查，卵母细胞发育分为五个时期，生殖周期分为五个时期。对卵原细胞的起源和闭锁过程进行了研究。在野生种群中，性腺指数(GSI)被发现是卵巢活动的准确指标。根据GSI、不同卵母细胞阶段的比例和卵大小，2岁以上的雌性鱼似乎在5-6月和8月下旬两个时期产卵，2岁的鱼在第一个时期产卵。推测的垂体促性腺激素的密度、丰度和核直径在8月上旬、卵巢发育完成后和产卵完成之前出现下降。
Apparently healthy, feral goldfish, Carassius auratus L., were collected from a pond in Cambridge, Ontario from March until November 1981, and during April 1982. Based on histological examination, oocyte development was divided into five stages and the reproductive cycle into five periods. The origins of oogonia and the atresia process were examined. The gonadosomatic index (GSI) was found to be an accurate indicator of ovarian activity in the feral population. Based on the GSI, proportion of various oocyte stages and egg size, females older than 2 years appeared to spawn during two periods, May to June and late August; 2-year-old fish spawned in the first period. There was a reduction in the density, abundance and nuclear diameter of presumptive pituitary gonadotrops in early August, after the completion of ovarian development and before the completion of spawning.