Stock identification study on elasmobranchs

软骨鱼种群鉴定研究

基本信息

批准号：
07456086
负责人：
TANIUCHI Toru
金额：
$ 4.8万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

Stock identification studies on elasmobranchs, particularly three species of sharks, were conducted using morphological, ecological, and genetic characters. Regarding starspotted dogfish Mustelus manazo, extensive study on stock identification was carried out based upon 1,514 specimens collected from seven localities. Morphological differences between localities were detected by canonical correlation analysis. There were also observed geographical differences in age and growth, showing trend of increase of growth and longevity toward the northern locality. The similar trend was also observed in lenngth at birth. Length and age at maturity showed a tendency of increase with latitude. Litter size showed an increase with parent length and the smallest number in Tokyo Bay at the same length whereas largest in Taiwan. However, the reproductive cycle in Aomori seemed to be quite different from other localities. Food habits also revealed geographical variations, demonstrating an increase in the ratio of stomach content weight to total weight toward south. As a result, it is suggested that there are at least five stocks of the starspotted dogfish around Japan. Regarding shornose spurdog Squalus megalops, paopulation studies were conducted using morphological and gentic characters based upon 133 specimens collected from seven localities in the world. Significant differences were observed in shape of dermal denticles and pectoral and caudal fins between localities, resulting in the separation of three groups, the Mediterranean, South Africa, and Japan and Australia. Genetically, three groups, Japan, Australia and South Africa were distinguished. For these reasons, the species complex was divided into four groups, Japan, Australia, the Mediterranean and South Africa. Regarding the oceanic whitetip shark Carcharhinus longimanus, age, growth and reproduction were elucidated in the Pacific Ocean for the first time and fundamental information on stocks of the shark was obtained.

使用形态学，生态和遗传特征对弹性分支，尤其是三种鲨鱼的库存识别研究进行了研究。关于星报dog鱼Mustelus manazo，根据从七个地区收集的1,514个标本进行了有关库存识别的广泛研究。通过规范相关分析检测到地方之间的形态差异。还观察到了年龄和增长的地理差异，显示出增长和寿命增加的趋势。出生时的Lenngth也观察到了类似的趋势。成熟时的长度和年龄显示出随纬度的增加的趋势。垃圾的大小显示出父母长度的增加，而东京湾的数量最小，而台湾最大。但是，Aomori中的生殖周期似乎与其他地方有很大不同。粮食习惯还显示出地理变化，表明胃含量重量与南方总体重的比率增加。结果，建议在日本各地至少有五个星星狗鱼。关于Shornose Spurdog Squalus Megalops，根据来自世界上七个地区收集的133个标本的形态和绅士特征，使用形态学和绅士角色进行了吞噬研究。在地方的皮肤齿状牙齿和胸鳍和尾鳍之间观察到显着差异，从而导致三组分离地中海，南非，日本和澳大利亚。从遗传上讲，三个组织，日本，澳大利亚和南非被区分了。由于这些原因，该物种综合体分为四组，即日本，澳大利亚，地中海和南非。关于海洋的halletip鲨鱼Carcharhinus longimanus，首次在太平洋中阐明了年龄，生长和繁殖，并获得了有关鲨鱼库存的基本信息。