東京湾におけるトリガイの漁獲量変動と個体群構造

• 田 永軍

  東京大学農学部水産学科 新日本気象海洋(株)環境情報研究所

• 清水 誠

  東京大学農学部水産学科

書誌事項

タイトル別名

• Catch Yield Fluctuation and Population Structure of Fulvia mutica (Reeve) in Tokyo Bay.
• トウキョウワン ニ オケル トリガイ ノ ギョカクリョウ ヘンドウ ト コタイ

抄録

The present work was carried out on the catch yield fluctuation and population structure of the cockle fulvia mutica in Tokyo Bay. The fishing season of the cockle is from Apri1 to early August. Most of the catches are recorded in May and June. The CPUE is high in the beginning of the fishing season and shows a sharp decrease throughout the fishing season. It seems that the CPUE is a good index of the population size of Fulvia mutica.<br>The catches are divided into six market size categories after landing. The two smallest market size categories account for most of the catches, and their percentages in the catch increase during the fishing season. However, shell lengths of the six market size categories are between about 43 to 70mm, and the difference in categories does not mean that in year class. More than 50 to 70 percent of the total catches are from 50 to 60mm in shell length, which corresponds to just one year in age. It is considered that the population of the cockle is dominated by one year class. Simplicity of age compositions in the population was supposed to be one of the important factors causing the drastic fluctuation in the catches in Tokyo Bay.

収録刊行物

• 日本水産学会誌

  日本水産学会誌 63 (3), 353-360, 1997

  公益社団法人 日本水産学会

キーワード

• トリガイ
• 銘柄組成
• 個体群構造
• 東京湾

詳細情報

• CRID: 1390282681388110464
• NII論文ID: 10004851072
• NII書誌ID: AN00193422
• DOI: 10.2331/suisan.63.353
• ISSN: 1349998X
• ISSN: 00215392
• NDL書誌ID: 4217673
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030570413
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4217673
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可