Biological observations on the common guitarfish Rhinobatos rhinobatos from İskenderun Bay (Turkey, Eastern Mediterranean)
Biological observations on the common guitarfish Rhinobatos rhinobatos from İskenderun Bay (Turkey, Eastern Mediterranean)
复制标题
伊斯肯德伦湾常见吉他鱼 Rhinobatos rhinobatos 的生物学观察（土耳其，东地中海）
DOI：
10.1163/157075609x437727
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
N. Başusta
中科院分区：
文献类型：
--
作者：
Ş. Çek;M. Karalar;S. Demirhan;N. Başusta
生殖腺组织学检查表明，每只雄性红腹锦鸡都有精子发生。在一年的秋季和冬季采集的。精巢由多个小叶组成，其内有大量精囊，呈背腹带状排列。目前的结果表明，由于R。河豚具有囊状精子发生模式，可作为生物医学和毒理学研究的模型。8个阶段的成熟女性和7个阶段的成熟男性被确定。此外，卵黄发生卵母细胞一致发现，在每个女性在夏季收集。在卵黄发生卵母细胞中，卵黄以多形性小滴存在，小的卵黄小滴通常具有结晶构型。这些数据表明，两性在一年中的不同时间都有生殖活动。右侧卵巢/睾丸和左侧卵巢/睾丸功能正常。成熟卵母细胞在卵巢中呈对称分布。该群体由无胎盘胎生个体组成，胚胎发育为卵营养型。虽然，R.结果表明，各年龄组的性别比与预期的1：1无显著性差异（P>0.05），性别比略有偏向雌性。© Koninklijke Brill NV，莱顿，2009
Histological examination of the gonads showed that spermatogenesis occurs in every male R. rhinobatos collected in autumn and winter months of the year. Th e testis was composed of lobes having numerous spermatocysts in a dorsoventral zonated arrangement. Present results suggest that since R. rhinobatos have a cystic mode of spermatogenesis it can be used as a model for biomedical and toxicological studies. Eight stages of maturation for females and seven stages of maturation for males were identifi ed. Moreover, vitellogenic oocytes were consistently found in every female collected during the summer months. In vitellogenic oocytes, yolk is present as pleomorphic droplets and very often; small yolk droplets have a crystalline confi guration. Th ese data suggest that both sexes are reproductively active at diff erent times of the year. Both, the right ovary/testis and the left ovary/testis were functional. Ripe oocytes in the ovaries were usually symmetrically distributed. Th e population consisted of aplacental viviparous individuals with lecithotrophic embryo development. Although, sex ratios of R. rhinobatos were not signifi cantly diff erent from the expected 1:1 ratio (p>0.05), slightly female biased sex ration were recorded. © Koninklijke Brill NV, Leiden, 2009