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A preliminary investigation of the Tuna resources off the South West African coast
van den Berg, R.A.; Matthews, J.P. (1969). A preliminary investigation of the Tuna resources off the South West African coast. Investigational Report. Administration of South West Africa. Marine Research Laboratory, 15. Administration of South West Africa: Windhoek. 39 pp.
Part of: Investigational Report. Administration of South West Africa. Marine Research Laboratory. Administration of South West Africa: Windhoek. ISSN 0083-7164, more

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  • van den Berg, R.A.
  • Matthews, J.P.

Abstract
    The meristic characteristics, sex ratio, numerical importance and distribution in space and time of Thunnus alalunga, T. obesus, T. albacares and T. thynnus, occurring off the South West African Coast are discussed. An equation expressing the length-weight relationship of longfin tuna is given. It is found that the four species are susceptible to water temperatures in their distribution and are differentially spread off the coast. The state of development of the gonads suggest that these four species do not spawn in the survey area. Fish and squid are shown to be the most important organisms in the diet of the tuna.

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