Development of a multi-cohort analysis method and its application to the Indian Ocean yellowfin tuna [Thunnus albacares] length composition

A new multi-cohort model with the use of fishing effort as a tuning factor was developed and applied to yellowfin tuna (Thunnus albacares ) data of the Japanese longline fishery in the Indian Ocean from 1952 to 1980. The length compositions were converted to age compositions by means of normal curve...

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Bibliographische Detailangaben
Veröffentlicht in:	Bulletin - Far Seas Fisheries Research Laboratory (Japan) 1988-01 (25), p.1-72
Hauptverfasser:	Wang, C.H. (National Taiwan Univ., Taipei (Taiwan, Province of China)), Tanaka, S
Format:	Artikel
Sprache:	jpn
Schlagworte:	AGE ANALISIS ESTADISTICO ANALYSE STATISTIQUE DINAMICA DE LA POBLACION DYNAMIQUE DES POPULATIONS EDAD FISHERY RESOURCES INDIAN OCEAN LARGURA LENGTH LINE FISHING LONGUEUR Marine MORTALIDAD MORTALITE MORTALITY OCEAN INDIEN OCEANO INDICO PECHE A LA LIGNE PESCA CON LINEA POPULATION DYNAMICS PROGRAMACION PROGRAMMATION PROGRAMMING RECURSOS PESQUEROS RESSOURCE HALIEUTIQUE STATISTICAL ANALYSIS THUNNUS Thunnus albacares
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Beschreibung
Zusammenfassung:	A new multi-cohort model with the use of fishing effort as a tuning factor was developed and applied to yellowfin tuna (Thunnus albacares ) data of the Japanese longline fishery in the Indian Ocean from 1952 to 1980. The length compositions were converted to age compositions by means of normal curve fitting. The result of analysis showed a decrease of recruitment and population size. However, it should be noted that catches by the surface fisheries were neglected in the calculations.
ISSN:	0386-7285