Size of mysids eaten by juvenile flounder Paralichthys olivaceus and diurnal change of its feeding activity.
Size of mysids eaten by juvenile flounder Paralichthys olivaceus and diurnal change of its feeding activity.
复制标题
牙鲆幼鱼吃糠虾的大小及其摄食活动的日变化。
DOI：
10.2331/suisan.56.201
复制
发表时间：
1990
影响因子：
0.4
通讯作者：
Noriko Naganuma
中科院分区：
文献类型：
--
作者：
Y. Hirota;Y. Koshiishi;Noriko Naganuma
日本海鲽幼鱼主要以蛹为食。在197条比目鱼的胃中鉴定出5种mysid，其中包含1673个mysid标本。粗棘虫数量最多（93.5%）。其他种为新稻（Neomysis japonica）（5.3%）、中稻（A. nakazatoi）（0.9%）、日本稻（Nipponomysis perminuta）（0.2%）。倪。toriumii(0.1%)。利用总长度与甲壳长度、甲壳宽度、第6腹段长度、尾足外足长度、尾足内足长度和尾足长度六部分长度之间的回归方程，估算出胃内断肌的总长度。罗布斯塔鱼胃内最大尺寸随幼鱼尺寸增大而增大。体长小于20mm的比目鱼食用的甲壳为5.4mm，体长为20-25mm和25-30mm的比目鱼食用的甲壳迅速增大，分别为7.4mm和9.7mm。小于35mm的幼鱼主要以小于5mm的小蛹为食，而大于35mm的幼鱼则积极以大蛹为食（约占胃中蛹数量的30%）。30mm以下比目鱼胃肌重占体重的比例在傍晚达到峰值（4.9%），午夜后降至0%。大于30mm的幼鱼也有类似的摄食模式。
Juvenile flounder Paralichthys olivaceus in the Sea of Japan mainly fed on mysids. Five mysid species were identified in the 197 stomachs of the flounder examined, and they contained 1673 specimens of mysids. Acanthomysis robusta was most numerous (93.5%). Other species were Neomysis japonica (5.3%), A. nakazatoi (0.9%), Nipponomysis perminuta (0.2%). Ni. toriumii (0.1%). Total length of broken mysid in stomach was estimated using the regression equations between total length and the six part lengths i.e. carapace length, carapace width, length of 6th abdominal segment, exopod length of uropod, endopod length of uropod and telson length. Maxi-mum size of A. robusta in stomach increased with size of juvenile flounder. Mysid eaten by the flounder less than 20mm in body length was 5.4mm, and ones consumed by the20-25mm and 25-30mm flounder became rapidly larger to 7.4mm and 9.7mm, respectively. Juveniles less than 35mm mainly fed on small mysids less than 5mm, whereas ones greater than 35mm actively fed on large mysids (>30% of mysid number in stomachs). The percentage of mysid weight in stomachs to body weight of flounder less than 30mm was peaked (4.9%) in the evening, whereas the percentage dropped to 0% after midnight. A similar diurnal feeding pattern was found for juveniles greater than 30mm.