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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47621

Title: 臺灣北部海域斑竹狗鮫之胃內容物分析
Analysis of stomach contents of the whitespotted bamboo shark, Chiloscyllium plagiosum in the northern waters off Taiwan
Authors: Lin, Yu-Han
林玉涵
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: 斑竹狗鮫;臺灣;攝食生態;餌料生物
whitespotted bamboo shark;Chiloscyllium plagiosum;Taiwan;feeding ecology;prey
Date: 2016
Issue Date: 2018-08-08T03:25:01Z
Abstract: 斑竹狗鮫(Chiloscyllium plagiosum)是台灣北部海域重要的小型鯊魚,在此海域底棲生態系中扮演重要的角色,但有關其攝食生態的相關研究仍然缺乏。因此,本研究針對台灣北部海域之斑竹狗鮫進行食性研究。本研究自2013年10月起至2015年3月於新北市富基漁港進行樣本採集,所得樣本總計327尾(雌魚126尾、雄魚201尾),其中207尾為非空胃樣本,空胃率為36.7%。本研究透過傳統種類辨識方法將斑竹狗鮫胃內容物分成14類,其中以尋常海綿綱(Demospongidae)所佔的比例最高,餌料生物相對重要性指數(%IRI)為40.69%,其次為不知名餌料(Unidentified prey)佔21.54%,多毛綱(Polychaeta)居第三位18.10%,其餘有長尾下目(Macrua)佔10.56%,硬骨魚綱(Osteichthyes)佔5.88%,頭足綱(Cephalopoda)佔1.7%,無刺綱(Anopla)佔0.56%,歐努菲蟲科(Onuphidae)佔0.54%,磯沙蠶科(Eunicidae)佔0.19%,腹足綱(Gastropoda)佔0.12%,短尾下目(Brachyura)佔0.09%,耳棘老板鯆(Okamejei acutispina)佔0.02%,異尾下目(Anomura)佔0.01%,真紅藻綱(Florideophyceae)佔0.004%。研究結果顯示斑竹狗鮫隨著個體成長而改變攝食對象,未成熟個體攝食較多甲殼類,而成熟個體攝食較多硬骨魚類。在春季以不知名餌料生物和多毛類為主要攝食對象;夏季主要攝食多毛綱;而秋季攝食較多的海綿;冬季時以海綿和不知名餌料生物為主食,而且甲殼類的攝食比例明顯增加。此現象顯示本種在不同季節會以不同的餌料生物為食,但整體來說皆以海綿為主要餌料生物。本研究發現成熟雌性在交配及產卵期前攝食比例有增加的現象,捕食的對象包含頭足類、硬骨魚類、海綿、多毛類等營養位階較高或容易捕食的餌料生物,此現象可能與交配及產卵時需要能量來維持體力有相關性。
The whitespotted bamboo shark (Chiloscyllium plagiosum) is a dominant small shark species in the northern waters of Taiwan and it plays an important role in the benthic ecosystem in this region. However, the feeding ecology of this species is still limited. Therefore, the objective of this study was to examine the feeding habits of whitespotted bamboo shark in the northern Taiwan waters, based on 327 specimens (126 females, 201 males) collected at Fu-Chi fish market in New Taipei city from October 2013 to March 2015. Of the specimens, 120 stomachs were empty and the stomach empty rate was 36.7 %. A total of 14 prey taxa were identified, including the Demospongidae (% IRI=40.69%), followed by Unidentified prey (21.54%), Polychaeta (18.10%), Macrua (10.56%), Osteichthyes (5.88%), Cephalopoda (1.7%), Anopla (0.56%), Onuphidae (0.54%), Eunicidae (0.19%), Gastropoda (0.12%), Brachyura (0.09%), Okamejei acutispina (0.02%), Anomura (0.01%), and Florideophyceae (0.004%). The intraspecies diet composition may vary due to many factors, including different life stages, sex, seasons, and fishing gears. In this study, ontogenetic change for whitespotted bamboo shark was found. Immature individuals feed more on crustaceans, while mature individuals prefer teleost fishes. Mature females were more active in feeding before mating and spawning period, they fed on cephalopods, teleost, sponges, and polychaetes, this behavior may help whitespotted bamboo shark save energy for reproduction. There was no significant difference on prey composition by fishing gears and seasons, but the major prey item varied by season. In the spring, unidentified prey and polychaete were the main prey item; in the summer, the polychaetes was the dominated prey item; in the fall, sponge and a small amount of teleost were found; in the winter whitespotted bamboo sharks mainly fed on sponges and unidentified prey, but the proportion of crustaceans increased. In sum, whitespotted bamboo sharks mainly feed on benthic prey species, but the diet of this shark varied by mature stages, sex, habitat, and seasons.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010231006.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47621
Appears in Collections:[環境生物與漁業科學學系] 博碩士論文

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