Morphometric analysis of yellowfin tuna, Thunnus albacares, from the Eastern Pacific Ocean

Schaefer, Kurt M. (1989) Morphometric analysis of yellowfin tuna, Thunnus albacares, from the Eastern Pacific Ocean. Inter-American Tropical Tuna Commission Bulletin, 19(5), pp. 387-427.

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ENGLISH: Morphometric data from yellowfin tuna, Thunnus albacares, were collected from various locations in the eastern Pacific Ocean during 1974 to 1976, to assess geographic and temporal variation of morphometric characters. The data were statistically adjusted, using allometric formulae to partition size. Discriminant analyses were applied to the adjusted morphometric characters. Yellowfin sampled from north of 15°N-20oN were different from those sampled from south of 15°N-20oN. The absence of any clinal relationships between morphometric characters and latitude or longitude suggests a pattern of somewhat distinct regional groups. These results clearly demonstrate geographic variation in morphometric characters of yellowfin in the eastern Pacific Ocean, which suggests differences between the life histories of the northern and southern groups. SPANISH: Entre 1974 Y1976 se tomaron datos morfométricos de atunes aleta amarilla, Thunmus albacares, de varios lugares en el Océano Pacífico oriental, a fin de evaluar la variación geográfica y temporal de los caracteres morfométricos. Se ajustaron los datos estadísticamente, usando fórmulas alométricas para eliminar los efectos del tamaño. Se aplicaron análisis discriminantes a los caracteres morfométricos ajustados. Aletas amarillas muestreados provenientes del norte de 15°N-20°N eran diferentes a aquellos muestreados del sur de 15°N -20°N. La falta de una relación clinal entre los caracteres morfométricos y latitud o longitud sugiere la existencia de grupos regionales algo distintos. Estos resultados demuestran claramente una variación geográfica en los caracteres morfométricos del aleta amarilla en el Océano Pacífico oriental, la cual sugiere diferencias en los ciclos vitales de los grupos del norte y del sur. (PDF contains 41 pages.)

Item Type: Article
Title: Morphometric analysis of yellowfin tuna, Thunnus albacares, from the Eastern Pacific Ocean
Alternative Title: Análisis morfometrico del atún aleta amarilla, Thunnus albacares, del Océano Pacifico Oriental
Personal Creator/Author:
Schaefer, Kurt M.
Journal or Publication Title: Inter-American Tropical Tuna Commission Bulletin
Volume: 19
Number: 5
Page Range: pp. 387-427
Date: 1989
Issuing Agency: Inter-American Tropical Tuna Commission
Additional Information: This article is bilingual and contains both Spanish and English translations.
Uncontrolled Keywords: morphometric analysis; yellowfin tuna; Thunnus albacares; Eastern Pacific Ocean; análisis morfometrico; atún aleta amarilla; Océano Pacifico Oriental
Subjects: Fisheries
Item ID: 3483
Depositing User: Joan Parker
Date Deposited: 02 Jun 2010 04:23
Last Modified: 29 Sep 2011 17:19

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