Apparent Abundance, Distribution, and Migrations of Albacore, Thunnus Alalunga, on the North Pacific Longline Grounds (Classic Reprint) - Couverture souple

Rothschild, Brian J.

9781332814602: Apparent Abundance, Distribution, and Migrations of Albacore, Thunnus Alalunga, on the North Pacific Longline Grounds (Classic Reprint)

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ISBN 10 : 1332814603 ISBN 13 : 9781332814602

Editeur : Forgotten Books, 2018

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Unlock the movement and mystery of North Pacific albacore. This study analyzes how the albacore population appears to change on the North Pacific longline grounds, using catch-per-unit-effort data and spatial statistics to map where these fish travel and why numbers shift over time.

Two decades of observations (1949–1961) show a clear decline in apparent abundance, not tied to fish size or effort alone. The work also traces how albacore migrate between North American coastal waters and Japanese fisheries, highlighting a predominant route from North American areas to pole-and-line fleets, then to longline grounds. The analysis combines population dynamics with migratory models to explain yearly patterns and movement.

What you’ll explore
- How apparent abundance and CPUE are tracked over time and space
- The seasonal and geographic patterns seen in longline, pole-and-line, and coastal fisheries
- The proposed migratory route and its implications for fishing pressure and population dynamics
- The role of spatial statistics in describing distribution and predictability of albacore movements

Ideal for readers of fishery science and oceanography who want a clear, data-driven view of albacore migrations and stock dynamics in the North Pacific.

Les informations fournies dans la section � Synopsis � peuvent faire r�f�rence � une autre �dition de ce titre.

�diteur: Forgotten Books
Date d'�dition: 2018
Langue: anglais
ISBN 10: 1332814603
ISBN 13: 9781332814602
Reliure: Broch�
Nombre de pages: 52
Coordonn�es du fabricant: Copytech (UK) Ltd, Trading as Printondemand-worldwide.com
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Apparent Abundance, Distribution, and Migrations of Albacore, Thunnus Alalunga

Brian J. Rothschild, Marian Y. Y. Yong

Edit� par Forgotten Books, 2018

ISBN 10 : 1332814603 ISBN 13 : 9781332814602

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Vendeur : Forgotten Books, London, Royaume-Uni

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Paperback. Etat : New. Print on Demand. This book provides a deep analysis of albacore dynamics in the North Pacific. It explores data to identify a pattern of decline in apparent albacore abundance on the longline grounds. However, it finds no significant average size change or any apparent correlation with effort expended fishing. Using spatial statistics, the author demonstrates the cyclical nature of albacore distribution on the longline grounds, showing a clear southwest movement of the two-dimensional first moment at a velocity of about 86 kilometers (53 miles) per day. The author suggests the movement pattern is more likely due to tortuous migration rather than swimming velocity. The book delves into migration routes, presenting evidence that indicates a predominant movement from the North American to Japanese pole-and-line to Japanese longline fisheries. It combines this data with spatial moment movement patterns to provide the most detailed model of albacore migration in the North Pacific. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. N� de r�f. du vendeur 9781332814602_0

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