The Use of Histological Techniques to Study the Reproductive Biology of the Hermaphroditic Mediterranean Fishes Coris julis, Serranus scriba, and Diplodus annularis
The Use of Histological Techniques to Study the Reproductive Biology of the Hermaphroditic Mediterranean Fishes Coris julis, Serranus scriba, and Diplodus annularis
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DOI：
10.1080/19425120.2011.556927
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发表时间：
2011-01-01
影响因子：
1.7
通讯作者：
Saborido-Rey, Fran
中科院分区：
文献类型：
--
作者：
Alonso-Fernandez, Alexandre;Alos, Josep;Saborido-Rey, Fran
组织学技术在生殖研究中的有用性和重要性已被广泛讨论的生殖分布鱼类。在两性鱼类的情况下，组织学是正确识别性别模式的特别重要的工具（即，顺序的、同时的或无功能的两性畸形）。我们用组织学的方法来描述雌雄同体，卵泡发育的动力学，产卵模式在三个物种从地中海西北部（巴利阿里群岛，西班牙）：地中海彩虹濑鱼Coris朱利斯（顺序雌雄同体），画精梳机Serranus scriba（同时雌雄同体），和环形海鲷Diplodus annularis（非功能性雌雄同体）。在所有三个物种的次级生长卵泡的发展是异步的，和类似的高峰产卵活动发生在5月和7月之间。然而，显着的差异，在性周期和卵子生产被发现。对于彩绘精梳机，水化卵泡存在于卵巢组织中几乎每天在产卵季节的高峰期，这表明每天产卵，并增加自受精的机会，除非一种机制，以避免这种行动是在这个物种。间性的地中海彩虹濑鱼进行了鉴定，并在性别变化的大小和年龄估计为132毫米的总长度和4年，分别。以前的研究人员已经得出结论，环形海鲷是一个protandric雌雄同体，但我们的研究结果表明非功能性雌雄同体。这三个鱼种的商业价值不大，被认为是手工捕鱼船队的副渔获物，但它们很容易受到一些娱乐性钓鱼活动的影响。目前，尚未为这些物种制定具体的管理计划。我们解决的重要性，描述性模式及其对未来的保护工作的影响。
The usefulness and importance of histological techniques in reproductive studies have been widely discussed for gonochoristic fish species. In the case of hermaphroditic fishes, histology is a particularly important tool for the proper identification of sexual pattern (i.e., sequential, simultaneous, or nonfunctional hermaphroditism). We used a histological approach to describe hermaphroditism, dynamics of follicle development, and spawning patterns in three species from the northwestern Mediterranean Sea (Balearic Islands, Spain): the Mediterranean rainbow wrasse Coris julis (sequential hermaphrodite), painted comber Serranus scriba (simultaneous hermaphrodite), and annular sea bream Diplodus annularis (nonfunctional hermaphrodite). Development of secondary growth follicles was asynchronous in all three species, and similar peaks in spawning activity occurred between May and July. However, notable differences in sexual cycle and egg production were found. For the painted comber, hydrated follicles were present in ovarian tissue almost every day during the peak of the spawning season, suggesting daily spawning and increasing the chances of autofertilization unless a mechanism to avoid this action is present in this species. Intersexual Mediterranean rainbow wrasses were identified, and the size and age at sex change were estimated to be 132 mm total length and 4 years, respectively. Previous investigators have concluded that the annular sea bream is a protandric hermaphrodite, but our results indicate nonfunctional hermaphroditism. These three species are of little commercial interest and are considered to be bycatch by the artisanal fleet, but they are vulnerable to the impacts of some recreational angling activities. Currently, no specific management plan has been developed for these species. We address the importance of describing sexual pattern and its implications for future conservation efforts.