Fisheries Biology of Loliginid Squids in Yi-Lan Bay, Northeast Taiwan

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Project title

Code/計畫編號

NSC102-2313-B019-007

Translated Name/計畫中文名

宜蘭灣鎖管物種之漁業生物學研究(III)

Project Coordinator/計畫主持人

Chih-Shin Chen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Marine Affairs and Resource Management

Website

https://www.grb.gov.tw/search/planDetail?id=3093971

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

01-07-2014

Bugetid/研究經費

1110千元

ResearchField/研究領域

漁業

"海洋漁業資源為人類提供一定糧食保障(food security)，但全球主要商業目標物種已面臨匱乏之危機。頭足類為海洋生態系營養結構之重要組成，亦被認為目前尚能支應漁業擴展之海洋資源之一。但是商業開發可能間接影響捕食頭足類之其他物種。探察頭足類物種之組成，分析其組成及族群結構變化趨勢，及其在海洋生態系之角色，為實踐漁業生態系統措施之重要基礎。目前頭足類之研究，多聚焦在支持大型商業性漁業之目標物種(尤其大洋魷類)，並以探討資源量變動及影響機制居多。相對而言，臺灣周邊水域之頭足類研究仍相當有限。宜蘭灣水域為海洋資源物種的重要棲地，亦為臺灣沿近海漁業的主要作業區。在長期漁捕壓力下，主要商業物種之數量與結構可能出現變化。本研究目的為瞭解宜蘭灣頭足類物種之組成及變動趨勢，並探察優勢鎖管物種之族群結構，及環境狀態變動對成長參數之效應。本年(第三年)計畫內容包括：1) 透過標本船每月採集頭足類物種，分析宜蘭灣頭足類(鎖管物種)組成及族群結構。 2) 選定優勢鎖管物種(劍尖鎖管)，以平衡石微構造分析其族群結構及成長與成熟型態。 3) 分析年別季節群成長參數，探討環境狀態變動對季節群成長參數之效應。此結果將對宜蘭灣頭足類物種組成有進一步瞭解，後續並可應用於探察海洋生態系之變動。 " "Marine fisheries resources provide food security to a degree for human, while at least 75% of the exploited stocks were in overfishing or depleted status. Cephalopods are an important component in trophic structure of marine ecosystem and are suggested as one of the marine resources to support the development of fisheries. However, commercial exploitation of cephalopods may indirectly affect the species foraging cephalopods. An understanding of species composition, temporal variation in population structure and the role in ecosystems are substantial information to achieve the objectives for ecosystem approaches to fisheries. Most of the studies for cephalopods focused on commercially important species which supporting large-scale fisheries (particular for pelagic squids), and analyzed the variability in abundance and distribution with related environmental factors. In contrast, cephalopod studies around Taiwan are scarce. Yi-lan Bay, located at Northeast Taiwan, is an essential habitat for several marine resources, and also an important fishing ground for the neritic fisheries in Taiwan. The abundance and structure of exploited species in Yi-land Bay may have changed after a long-term exploitation. The objectives of this study (the 3rd year) are: 1) to examine the monthly composition of cephalopod species in Yi-land Bay by a trawler sampling; 2) to analyze the growth and maturation of one dominant loliginid species (Uroteuthis (Photololigo) edulis); and 3) to analyze the influences of environmental conditions on growth parameters of the seasonal cohort of the squid. These results will improve our knowledge on population structure of the cephalopod species off Northeast Taiwan and may apply to explore the changing ecosystems in the future. "

Keyword(s)

頭足類
漁業
平衡石
成長
生活史參數
族群結構
宜蘭灣
Cephalopod
Fisheries
Statolith
Growth pattern
Life history traits
Population structure
Yi-lan Bay

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Fisheries Biology of Loliginid Squids in Yi-Lan Bay, Northeast Taiwan

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