The present study was carried out to determine gonadal stages and quality of pearl oyster meat ( Pinctada imbricata radiata , Leach, 1814) in Izmir Bay (Turkey). Pearl oyster samples were collected from the study area at a depth of ~5 m between February 2013 and January 2014. The highest and lowest temperature was measured in July and January as 27°C and 14.2°C, respectively. The maximum chlorophyll a value of 4.640 μg l −1 was calculated in May and the lowest value of 1.009 μg l −1 was recorded in April. Individuals reached their first maturity in April. Spawning activity was observed from June to September and the gonad index (GI) was at the highest level during those months. The development was observed from April to February. The overall female to male ratio was 1.32:1 ( p < 0.05) and it did not affect the GI ( p > 0.05). There is a strong positive correlation between the GI and temperature ( p < 0.05). The highest condition index (CI) was recorded in May as 12.31 ± 0.51, whereas the lowest one in January as 7.37 ± 0.22. As a result, this study revealed that the pearl oyster population in the region is characterized by high reproductive activity, especially during the summer months.

中文翻译：

---

伊兹密尔湾的放射牡蛎（Pinctada imbricata radiata，Leach 1814）的生殖生物学

本研究旨在确定伊兹密尔湾（土耳其）珍珠牡蛎肉的性腺发育阶段和质量（Pinctada imbricata radiata，Leach，1814）。在2013年2月至2014年1月之间，从研究区收集了约5 m深度的珍珠牡蛎样品。7月和1月的最高和最低温度分别为27°C和14.2°C。5月计算的最大叶绿素a值为4.640μgl -1，4月记录的最低值为1.009μgl -1。个人在4月达到了第一次成熟。从六月到九月观察到产卵活动，并且在那几个月中性腺指数（GI）处于最高水平。观察到从4月到2月的发展。男女总比例为1.32：1（p <0.05），并且不影响GI（p> 0.05）。胃肠道和温度之间有很强的正相关性（p <0.05）。五月份的最高病况指数（CI）为12.31±0.51，而一月份的最低病况指数为7.37±0.22。结果，这项研究表明该地区的牡蛎种群具有很高的繁殖活性，特别是在夏季。