Marine Environmental Effects on the Spatio-Temporal Distribution and Abundance of Sailfish in the Atlantic Ocean

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Project title

Code/計畫編號

MOST105-2611-M019-010

Translated Name/計畫中文名

海洋環境因子對大西洋雨傘旗魚時空分布與資源豐度變動之影響

Project Coordinator/計畫主持人

Nan-Jay Su

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Environmental Biology and Fisheries Science

Website

https://www.grb.gov.tw/search/planDetail?id=11891291

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

31-07-2017

Bugetid/研究經費

887千元

ResearchField/研究領域

海洋科學

雨傘旗魚(Istiophorusp!atypterus)是海洋生態系重要頂級掠食者，也是商業性延繩釣或休閒漁業的漁獲對象之一，然而在大西洋海域雨傘旗魚族群動態與資源相關資訊十分缺乏，有效管理之系群數目與地理界限等資訊不足，各系群的環境資訊與棲息地特性等相關研究也付之闕如，實有必要進行雨傘旗魚時空分布模式之研究，以釐清海洋環境因子對大西洋雨傘旗魚資源豐度之影響，有助於大西洋台灣鮪釣漁業之管理。在不同時空尺度下，環境特性及變異影響漁場分布的範圍與資源的變動，包括海表層水溫、混合層深度、淨基礎生產力及水深，本研究將蒐集大西洋台灣鮪釣漁業資料，透過泛加成模式分析環境差異對雨傘旗魚釣獲率與棲地時空分布之影響，同時估計雨傘旗魚漁獲比例與漁獲量，並進行豐度指標標準化與趨勢分析。本研究結果將可瞭解資源相對豐度指標的變動趨勢，並探討雨傘旗魚可能的季節性洄游路徑，同時時空分布模式可以作為時空限制區管理方法建立之基礎，針對雨傘旗魚的時空分布特性，提供未來漁業管理之科學性參考依據，減少鮪延繩釣與圍網漁業混獲雨傘旗魚的機率，以及可能的管理措施對漁業所造成的影響。 Sailfish (Istiophorusplatypterus、, caught in the commercial longline and recreational fisheries, is an important apex predator in marine ecosystems. However, basic information is insufficient for effective management of sailfish resources. For example, knowledge of the number of independent stocks and their boundaries is lack for sailfish in the Atlantic Ocean. Furthermore, there is little research on the habitat-related information and characteristics for sailfish stocks in the Atlantic Ocean. It is therefore necessary to examine the effects of marine environmental factors on the sailfish distribution based on their spatio-temporal patterns. Oceanographic variations and characteristics may also influence the range of fishing ground and the resource at different spatial and temporal scales of the variable, including sea surface temperature, mixing layer depth, net primary production, and bathymetry. Fishery data of the Taiwanese tuna longline fleet in the Atlantic Ocean will be collected in this study, and used to examine the impact on catch rates and the habitat of sailfish, through the generalized additive modes. The catch ratio and landings of sailfish will be estimated and used to standardize the abundance index of this stock to show the temporal variation. The results from these analyses could also investigate the temporal trend of the relative abundance index and possible seasonal migration patterns for sailfish. The management of time-area restriction on fishing relies on the information derived from the model of spatio-temporal distribution of sailfish could be used to potentially decrease the bycatch in tuna longline and purse seine fisheries and reduce the impacts on fisheries due to the management for this species.

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Marine Environmental Effects on the Spatio-Temporal Distribution and Abundance of Sailfish in the Atlantic Ocean

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