Christo S W, Ivachuk C S, Ferreira-Júnior A L, Absher T M
Departamento de Biologia Geral, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil.
Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil.
Braz J Biol. 2016 Jun;76(2):300-6. doi: 10.1590/1519-6984.12514. Epub 2016 Mar 1.
The objectives of the present study is to describe the size for exploitation and gonadal maturation of L. pectinata in Peças Island in Paraná coast. Twenty two individuals were sampled every month, from an intertidal flat of the Peças River, Municipality of Guaraqueçaba, during two periods - summer/autumn and winter of the 2009. Environmental parameter data was obtained at the same time of the biological sampling: temperature, salinity and seawater transparency at the Peças River mouth. The animals' height, length, width, gross weight, wet weight of meat and dry weight of meat were measured at the lab. The gonad development stages (GDS), condition index (CI) and yield index (Y) were calculated. Sex identification was conducted by direct observation of the gonads and gametes under an optic microscope. Individuals were classified as males (M), females (F) or undetermined (U). The medium height observed was of 49.62 ± 6.84 mm. Period of more expressive gonad repletion were observed in summer when water temperature was higher. Results of GDS in both periods showed a predominance of partially filled gonad stages. This may be related with the fact that L. pectinata has intense gametogenesis activity, that is, the organisms do not have a resting interval, but go back to gonad restructuring rapidly after releasing the gametes. The continuity of the reproductive cycle of the specimens found in both studied periods could demonstrate a possible continuous reproduction of the species and a size for exploitation above 40.00 mm of height.
本研究的目的是描述巴拉那海岸佩萨斯岛的栉孔扇贝的可捕捞规格和性腺成熟情况。在2009年的两个时期——夏/秋和冬季，每月从瓜拉克萨巴市佩萨斯河的潮间带采集22个个体。在进行生物采样的同时获取环境参数数据：佩萨斯河河口的温度、盐度和海水透明度。在实验室测量动物的高度、长度、宽度、总重量、肉的湿重和干重。计算性腺发育阶段（GDS）、状况指数（CI）和产量指数（Y）。通过在光学显微镜下直接观察性腺和配子进行性别鉴定。个体被分为雄性（M）、雌性（F）或未确定（U）。观察到的平均高度为49.62±6.84毫米。在水温较高的夏季观察到性腺充实更明显的时期。两个时期的性腺发育阶段结果显示部分充实的性腺阶段占主导。这可能与栉孔扇贝具有强烈的配子发生活动这一事实有关，即生物体没有静止期，而是在释放配子后迅速恢复性腺重组。在两个研究时期发现的标本的生殖周期的连续性可以证明该物种可能进行连续繁殖，并且可捕捞规格为高度超过40.00毫米。
