Feeding habit of pinkgray goby, Amblychaeturichtys hexanema(BLEEKER), larvae caught by sirasu boat seine.

粉灰色虾虎鱼、Amblychaeturichtys hexama(BLEEKER)、sirasu 船围网捕获的幼虫的摄食习性。

• 批准号: 62560201
• 负责人: UOTANI Itsuro
• 金额: $ 1.22万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62560201/
• 关键词: Postlarval anchovy; Postlarval sardine; Postlarval pinkgrey gobby; Feeding habit; Feeding competition; Habitat; シラス漁場の特性; アカハゼ仔魚の生息水深; アカハゼ仔魚の出現時期; アカハゼ仔魚の生息塩分; シラス舟曳網; アカハゼ; 仔魚期

Pinkgray goby, Amblychaeturicliys hexanema (BLEEKER), occur significantly in boat-seining grounds aiming at shirasu, a commercial name of postlarvae of anchovy and sardine, in the northwestern Suruga Bay. The gobby may insert appreciable influence upon commercially important clupeids postlarvae. The author examined weight, and species and size composition of contents of digestive tract for clarifying food habits of the postlarval gobbles. The study provides clues to understand competition between the gobies and clupeids.1. Postlarvae of pinkgrey gobies and related species inhabit near the sea floor around 10 m depth in day-time, together with postlarval clupeids.2. In the northwestern Suruga Bay postlarvae of pinkgrey gobies, together with common gobby, Acanthogohius flavimanus Temminck & Schlegell, occur most abundantly during early April through mid- May when water temperature remains at 15.0ﾟ-16.5ﾟC, and then reduce its abundance with rise of temperature to 18.0ﾟ-19.6ﾟC.3. Zooplankton comprise major food items of postlarvae and juveniles of pinkgrey gobbles. Dominant species in digestive tract change by size of fish: nauplii of copepods for the fish less than 8.1 mm in total length, and Calanus in addition to the above nauplii and Paracalanus, Acartia, Corycaetis and Appendicularia for the larger fish.4. Content of digestive tract of gobbies differ both in species and size of individuals from plankton in net collection. The difference indicates selective feeding of juveniles of pinkgrey gobbies to zooplankton. It is assumed that gobbles selectively take the food items by size but not by species, because the fish avoid very small copepods of 0.60-0.69 mm in total length bat eat larger individuals.5. juveniles of pinkgrey gobby share the same habitat and food organisms with postlarval anchovy and sardine. The postlarval clupeoids may be competing with pinkgrey gobbies as well as common gobbles when the latter increase in number during spring.

粉灰色虾虎鱼（Amblychaeturicliys hexanema， BLEEKER）在鹤河湾西北部的渔船围网中大量出现，这些围网的目标是shirasu，这是凤尾鱼和沙丁鱼的幼鱼的商业名称。虾蛄可能对商业上重要的幼虫后期产生可观的影响。为了阐明幼虫幼虫的饮食习惯，作者对其体重、消化道内容物的种类和大小组成进行了研究。这项研究为理解虾虎鱼和圆尾鱼之间的竞争提供了线索。粉灰虾虎鱼及其亲缘种的幼鱼在白天与幼鱼一起生活在约10米深的海底附近。在鹤河湾西北部，粉灰虾虎鱼和普通虾虎鱼Acanthogohius flavimanus Temminck & Schlegell的幼鱼在4月上旬至5月中旬的水温保持在15.0 16.5 C之间时最多，然后随着水温的升高而减少到18.0 19.6 C。浮游动物是粉灰鱼幼体和幼虫的主要食物。3 .鱼类消化道优势种的大小不同：桡足类的nauplii以总长度小于8.1 mm的鱼类为主，而较大的鱼类除上述nauplii外，还有副acalanus、Acartia、Corycaetis和Appendicularia。净捕的浮游生物中，不同种类和大小的虾虎鱼消化道的含量不同。这一差异表明粉灰虾虎鱼幼鱼对浮游动物的选择性摄食。据推测，食人鱼是有选择性地根据大小而不是根据种类来进食的，因为它们不吃总长度为0.60-0.69毫米的非常小的桡足类动物，而只吃体型较大的个体。粉灰虾虎鱼的幼鱼与凤尾鱼和沙丁鱼有相同的栖息地和食物生物。当粉灰圆嘴鱼和普通圆嘴鱼在春季数量增加时，幼虫后圆嘴鱼可能会与后者竞争。

项目成果

魚谷逸朗: 日本水産学会誌.

鱼谷逸郎：日本水产学会杂志。

UOTANI, ITSURO: "Feeding habit of pinkgray goby, Amblychaeturichtys hexanema(Bleeker), larvae caught by sirasu boat seine." JOURNAL OF THE FACULTY OF MARINE SCIENCE AND TECHNOLOGY TOKAI UNIVERSITY.

UOTANI, ITSURO：“粉灰色虾虎鱼、Amblychaeturichtys hexama（Bleeker）的摄食习性，以及 sirasu 船围网捕获的幼虫。”