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- OpenAccess
Demersal Fish Assemblages by Bottom Trawler in Northwestern Waters of Taiwan: A Case Study on Cruise 21-30 July 2004
臺灣西北部海域底棲性魚類的群組現象－以2004年7月份的調查航次研判
摘要
本研究之主要目的為瞭解我國西北部海域底棲魚類的群組特性。2004年7月21-30日期間，利用本所「水試一號」試驗船針對臺灣西北部海域，共計進行24測站的底拖網次調查試驗。調查海域計分為四個海區即A（東北部海區，1-6網站）、B（基北海區）、C（桃竹海區）、D（苗栗海區）。各測站除計算各漁獲魚種的線性生物量及夏農•魏能指數(Shannon-Wiener index)，同時，利用NTSYS-pc中UPGMA的群組軟體進行分析；底棲魚類因種別較為複雜，因此，線性生物量僅取等於或大於0.5者約佔魚類魚獲量的98%，蝦、蟹及頭足類則全部取樣。 各測站之夏農•魏能歧異度指數除第1網站值分別0.08較低外，其餘各網站均在0.59以上，其原因為第1網站具有優勢種真鯵Trachurus japonicus(96.7%)的緣故。各測站之夏農•魏能歧異度指數與與水深沒有顯著的相關性。 經由29種優勢魚種（線性生物量僅取大於0.5）分析區域與魚種群組結果發現，魚類方面可區分為2群組，區域可分2群組；由14蝦類分析群組結果發現，蝦類方面可區分為2群組，區域可分2群組；由15蟹類分析群組結果，蟹類可分為3群組，區域則可分2群組；由7頭足類分析群組結果，頭足類可區分為2群組，區域可分2群組。
並列摘要
The purpose of this study is to realize the characteristics of demersal fish assemblages in northwestern waters of Taiwan. A total of 24 bottom trawl operations were conducted along the coast waters from northeast part of Taiwan to Miaoli areas at depths of 60.5-127.4 meters during 21-30 July 2004. Twenty-nine major fish species, 14 crustacean species, 15 crab species, and 7 cephalopoda were recorded respectively. The species found at duplicated stations and with a linear biomass equal to 0.5 or higher for fish occupying 98.2% of the fish caught. Crustacean, crabs, and cephalopoda were all used for the cluster analysis. Area groups and species groups were classified using the Bray-Curtis dissimilarity values and the UPGMA method. The relationship between the values of Shannon-Wiener index and the depth was not significant (p＜0.05). Two area groups and 2 fish species groups were divided using 29 dominant fishes of a log-transformed abundance value, 2 area groups and 2 crustacean species groups were divided using 14 crustacean collected, 2 area groups and 2 crab species groups were divided using 15 crabs collected, 2 area groups and 2 cephalopoda groups were divided using 7 cephalopoda. Based on the values of linear biomass calculated, we found that in area A especially at the station I may consider as one of the habitats of horse mackerel Trachurus japonicus.
延伸閱讀
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