Ciclo gametogénico e índice de condición de la almeja Chione fluctifraga en Bahía San Jorge, Golfo de California, México
REVISTA DE BIOLOGIA MARINA Y OCEANOGRAFIA(2013)
摘要
The gametogenic cycle of the black clam Chione fluctifraga of northwestern Mexico, collected from March 2009 through February 2010, was studied using conventional histological techniques and oocyte modal analysis. A condition index was also determined. Clams exhibited a semi-annual gametogenic cycle. The species generated the first oocyte cohort in spring (April) started its vitellogenic growth and remained continuous over 9 months until early winter (December). A resting period occurs in winter. Clams released gametes continuously throughout the reproductive period, but the main spawning occurred during the warmest period (>28 degrees C). Gametogenic activity seemed to be strongly regulated by water temperature. The average growth rate of oocyte cohorts was calculated (0.41 +/- 0.10 mu m day(-1)), with the most rapid growth (0.67 mu m day(-1)) from September through October. The condition index was higher in summer, but other peaks occurred in winter, producing accumulation of nutrients from increased phytoplankton biomass. The female: male ratio was 1:1.3; no hermaphrodites were detected. A reproductive classification is proposed. These results can help regulate exploitation and establish off-limit periods for this clam in the Gulf of California.
更多查看译文
关键词
Black clam,Chione fluctifraga,gametogenesis,spawning,oocyte stages,sex ratio
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要