漁況分析為評估漁場價值之重要方法之一。宜蘭縣與花蓮縣沿岸為台灣定置網漁業主要之漁場與生產地，其中以宜蘭縣東澳之新協發定置漁場與花蓮縣崇德之佳豐定置漁場，分別在該縣因經營時間都已超過30年，最具代表性。且其都使用雙落網漁具，經不斷改良，漁獲效率漸趨一致。為探討兩不同地區之漁場其漁況變動，爰收集自1996至2003年共8年之每日漁獲資料加以解析。
結果得知，新協發定置漁場之CPUE除1997年外，其餘年度皆較佳豐定置漁場為高；兩漁場之月平均漁獲量變化一致，春季(3月~5月)為主要漁期，此期間新協發定置漁場月別漁獲量約為佳豐定置漁場之2倍；新協發定置漁場年度漁獲魚種數介於122~172之間，平均有143種之多。由每年度漁獲量前20名之魚種中，得知8年度共有22種主要魚種，包括鯖科7種、鰺科5種，以及其他科別10種，這些主要魚種每年漁獲量平均佔年度總產量之82.53% (77.05~ 87.21%)；齒鰆(Sarda orientalis)，圓花鰹(Auxis rochei)和白帶魚(Trichiurus lepturus)為最重要之前三魚種；漁獲組成多樣性指數為1.17~1.52；均勻度指數為1.23~1.52。佳豐漁場年度漁獲魚種數介於99~162之間，平均有131種之多。由每年度漁獲量前20名之魚種中，得知8年度共有26種主要魚種，包括鯖科9種、鰺科4種，以及其他科別13種，這些主要魚種每年漁獲量平均佔年度總產量之82.46% (78.35~ 87.32%)。平花鰹(Auxis thazard)，無斑圓鰺(Decapterus kurroides) 和圓花鰹(Auxis rochei)為最重要之前三魚種；漁獲組成多樣性指數為1.16~1.63；均勻度指數為1.20~1.63。兩漁場大多捕獲沿岸洄游性魚種；月平均漁獲魚種數有顯著差異(p<0.05)，而主要魚種中有14種相同，包括鯖科6種、鰺科3種，以及其他科別5種。

Annual logbook catch data of the Hsinshefar and Chiafong fishing grounds from 1996 to 2003 were analysed to assess spatial variation in species composition. Most of the catch comprised pelagic migratory species in the two fishing grounds. Sarda orientalis, Auxis rochei and trichiurus lepturus were the important dominant species at the Hsinshefar fishing ground, while Auxis thazard, Decapterus kurroides and Auxis rochei were the important dominant species at Chiafong fishing ground. CPUE of the Hsinshefar was greater than that of Chiafong in all years except 1997. Main fishing season is the same in Spring. There were 122~ 172 species caught by set-net, average is 143, and the diversity index (H’) was 1.17~1.52, index of evenness (J’) was 1.23~1.52 at Hsinshefar and 99~ 162 species were caught, average is 131, diversity index (H’) was 1.16~1.63, index of evenness (J’) is 1.20~1.63 at Chiafong fishing ground. Annual mean production of the dominant species were comprised 82.53% (77.05% ~87.21%) at Hsinshefar and 82.46% (78.35 ~ 87.32%) of total yearly catch at Chiafong fishing ground. There was significantly different (p<0.05) with monthly average catch species between two fishing grounds. There are14 same dominant species, including 6 species of Scombridae, 3 species of Carangidae and 5 other species that they are most of migratory species in the two fishing grounds.