本研究以台灣西南海域的東港與梓官魚市場魚販販售一盤一百的底拖經濟魚類為調查對象，研究底拖經濟魚類不同體長大小的每重量單位價格分布，以未成熟個體魚類能夠成長至較高的每重量單位價格的體長大小才進行捕撈，使未成熟個體的魚類在經濟上做適度的利用，而達到階段式的管制底拖網的袋網網目規格的目的。本研究定義三種不同的捕撈體長-最小調查體長、最小經濟體長及最初成性熟體長，並依據過去底拖網網目選擇性研究的結果，推估上述各種捕撈體長的網目規格。
本研究建議在台灣西南海域分4階段逐步的管制底拖網目規格。第一階段為最小調查網目規格35~45 mm的管制，可減少下雜魚混獲比例、不影響漁民作業捕撈之漁獲量以及保護未成熟經濟魚類。第二階段為最小經濟網目規格50~60 mm的管制，可大量減少捕撈未成熟且每重量單位價格不高的小個體經濟魚類。第三階段為成熟體長網目規格65~70 mm的管制，可提供各種魚類成長至最初性成熟體長的機會，至少投入繁殖一次，使漁業資源增加入添。第四階段為最適經濟網目規格70~82 mm的管制，可使底拖網各種經濟魚類的販售的每重量單位價格達到最高。

The present research adopts with the application of the sequential mesh regulations on bottom trawl to study how to protect economic immature fishes. The experimental design includes first the determination of the relationships of fish size and the price per weight (PPW) of the economic demersal fishes sold as the one-hundred Dollars-a-plate manner in Tunkang and Zihguan fish markets in the southwestern coast of Taiwan. The obtained results were used to yield the catch of smaller size fishes and the lower PPW for regulating the economic immature fishes. The three kinds of regulated fish size were defined as the smallest surveyed size, smallest economic size, and smallest matured size. These regulated fish size were used as the body lengths of 50% selection (L50) to calculate the regulating mesh size.
This study presents that four steps are needed for the sequential mesh regulations of bottom trawl in the southwestern Taiwan. The first step is to regulate the mesh size between 35 and 45 mm for banning bottom trawler to catch fishes smaller than the smallest surveyed fish size. The objective of first step is to reduce the bycatch without affecting the landings of economic immature fishes sold in the fish market. The second step is to regulate the mesh size between 50 and 60 mm for banning bottom trawler catch fishes smaller than the smallest economic fish size, and to reduce the catch of smaller size fishes and the lower PPW of economic immature fishes. The third step is to regulate the mesh size between 65 and 70 mm for banning bottom trawler to catch fishes smaller than the smallest matured fish size. This is also to reduce the catch of economic immature fishes, and to increase the recruitment. The fourth step is to regulate the mesh size between 70 and 82 mm for banning bottom trawler catching the lower PPW of economic fishes that is not large enough to reach their optimal PPW.
The present research provides important data results for regulating the mesh size of bottom trawler operation for the achievement of sustainable coastal fishery in Taiwan.

目錄
摘 要………………………………………………………………….....I
Abstract…………………………………………………………………..II
謝 辭…………………………………………………………………..III
目 錄…………………………………………………………………..IV
表目錄…………………………………………………………………..VI
圖目錄……………………………………………………………...…VIII
第一章、前言 1
1-1. 拖網漁業的網目規格管理 3
1-2. 底拖網的網目選擇性相關研究 4
1-3. 研究目的 7
第二章、材料與方法 9
2-1. 底拖漁船作業海域與魚市場販售時間 9
2-2. 魚市場一盤一百塊的魚貨種類與價格調查 9
2-3. 最小調查體長、最小經濟體長及最初性成熟體長之定義…11
2-4. 底拖網的袋網網目調查……………………………………..11
2-5. 分析方法 12
第三章、結果 15
3-1. 一盤一百元之魚種數與相關魚種之網目選擇性研究 15
3-2. 一盤一百元底拖經濟魚種的體長分布 17
3-3. 東港與梓官魚市場底拖經濟魚類的最小經濟體長 45
3-4. 東港與梓官底拖網袋網網目大小 64
第四章、討論 66
4-1. 各魚種的各月變化及最小經濟體長的管制之探討………..67
4-2. 調查各魚種的各項體長之網目規格管制探討……………..74
參考文獻. 87
附 錄. 100

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