Fisheries Oceanography and Stock Assessment of Dosidicus gigas in the Southeast Pacific

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Project title

Code/計畫編號

102農科-11.1.1-漁-F5(1)

Translated Name/計畫中文名

美洲大赤魷漁海況暨資源研究

Project Coordinator/計畫主持人

Chih-Shin Chen

Funding Organization/主管機關

Council of Agriculture,Executive Yuan

Department/Unit

Institute of Marine Affairs and Resource Management

Website

https://www.grb.gov.tw/search/planDetail?id=2918044

Year

2013

Start date/計畫起

01-01-2013

Expected Completion/計畫迄

01-12-2013

Bugetid/研究經費

623千元

ResearchField/研究領域

漁業
海洋科學

計畫目標美洲大赤魷(Dosidicus gigas) 分布在東太平洋水域，為大體型的大洋表層魷類。其為東太平洋生態系之重要組成，於1970年代開始為魷漁業之目標物種。漁業壓力對美洲大赤魷資源量變動之影響，以及連帶之生態系效應，為漁業生態學之關注焦點。我國之美洲大赤魷漁業規模雖不大，但此漁場可為阿根廷魷添加量不足時之補充，且大赤魷目前已成為南太平洋區域漁業管理組織之管理對象，對其族群動態、海洋生態及漁業管理等有必要持續進行。本計畫擬解決問題有：1)分析美洲大赤魷資源豐度之空間分布型態；2)應用GAM模式分析美洲大赤魷資源量變動趨勢，探討時空間及環境因子之效應；3)應用Depletion方法估算美洲大赤魷之資源量，瞭解資源狀態；4)維護及更新美洲大赤魷漁獲資料，以支援區域漁業管理組織之需要。重要工作項目 1.空間分布型態 (1)整理美洲大赤魷漁獲統計資料，以每月每0.5度方格為時空單位。 (2)應用地理資訊系統，繪製美洲大赤魷資源豐度(CPUE)之年別，月別空間分布型態。 2.資源豐度與環境因子關係 (1)整理美洲大赤魷漁獲統計資料，以每月每0.5度方格為時空單位。 (2)建立泛加成模式：以CPUE為反應變數。以時間(年、月)，空間(經、緯度)，及環境因子(表層海水溫度及放鈎深度)為解釋變數。 (3)分析年間，及年內解釋變數與CPUE之關係。 3.資源量評估(Depletion法) (1)由採樣之生物資料，將漁獲量由重量(Catch in weight)，轉換為尾數(Catch in number)。 (2)計算每週之單位努力漁獲量(尾數)為資源量豐度指標，其中努力量為船日數(Vessel-day)。由週別CPUE趨勢，決定模式套適期間。 (3)由週別族群量(尾數)資料，套用Depletion方法，估算期初資源量及逃逸比例。 4.漁業資料維護：處理2012年之漁獲資料，檢視各筆資料之信度後，累入資料庫。預期效益 1)瞭解美洲大赤魷資源豐度之空間分布型態。 2)探察美洲大赤魷資源豐度指標(CPUE)變動趨勢，及其時空間、環境變數之效應。 3)應用資源量評估模式估算美洲大赤魷資源之期初族群量與逃逸比例，瞭解資源開發狀態。 4)支援我國提交南太平洋區域漁業管理組織之國家報告及漁獲資料。 The jumbo (or Humboldt) squid, Dosidicus gigas, is a large pelagic ommastrephid squid which distributed in the Eastern Pacific Ocean (EPO). The jumbo squid is an important component in ecosystem of the EPO and is the main target of squid fisheries in this region. The central challenge for fisheries ecology is to understand the abundance variations of resources under fishing pressure and its synergistic effects to the ecosystems. The jumbo squid fishery in Taiwan is not dominant in context of production or values, while it could act as a substitute for Illex argentious fishery and the jumbo squid has been a target species of SPRFMO. Therefore, it is essential to understand its population dynamics, environmental influences and fisheries management. The questions to be addressed in this projects are: (1) to explore the spatial distribution pattern of jumbo squid; (2) to analyze the CPUE variations and effects of environmental variables by GAM; (3) to estimate the population size and proportional escapement by depletion method ;(4) to maintain the database of catch and effort data of jumbo squid fishery. The working items are, 1) Re-arrange the dataset of jumbo squid in a monthly basis with a spatial resolution of 0.5 degrees. 2) Explore the spatial distribution patterns using GIS tools. 3) Analyze the variation of CPUE using GAM which involved temporal, spatial and environmental variables as explanatory variables. 4) Estimate initial population size (in number) and catchability coefficient using depletion methods. 5) Maintain and update catch and effort database from fishery in 2012. The expected results are, 1) Understand the spatial distribution patterns of squid stocks. 2) Understand the CPUE trend and influences of environmental variables. 3) Understand the stock status and the proportional escapement.4) Provide basic information for annual national report submitted to the commission of SPRFMO.

Keyword(s)

魷漁業
資源評估
美洲大赤魷
環境因子
漁業管理
東太平洋
Squid fisheries
Stock assessment
Dosidicus gigas
Environmental factors
Fisheries management
East Pacific

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Fisheries Oceanography and Stock Assessment of Dosidicus gigas in the Southeast Pacific

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