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  • 1985-1989  (3)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Biometrics of Sardinella longiceps Val. in relation to upwelling in the Gulf of Aden (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 30 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Growth, size composition, condition factor and gonad index of the oil sardine, Sardinella longiceps Val., oscillated over an annual cycle in relation to upwelling. Growth in length was modelled using the formula of Pauly & Gaschütz (1979):〈displayedItem type="mathematics" xml:id="mu1" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:00221112:JFB67:JFB_67_mu1"/〉where Lt= length cm at age t years, L∞= 23.8cm, K=0.97, to=0.70, C=1.08 and ts=−0.08. The relationship of growth rate, spawning, and condition factor, to upwelling and plankton blooms is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05733.x
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  • 2
    Electronic Resource
    Electronic Resource
    Growth, mortality, age composition and fisheries yields of fish from the Gulf of Aden (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 27 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Tropical fish were collected by trawling in Yemeni waters. Age determinations were made on sections of vertebrae which were cross checked with scales. The values for the von Bertalanffy growth constants K were in the range 0.08–0.31. Total mortalities (Z) calculated from age compositions were in the range 0.31 to 0.67 for 11 species. The mean of 0.46 agreed closely with that derived from the formula of Pauly (1980a) of 0.45. Since the former included fishing mortality (F) in addition to natural mortality (M) it was suggested that a lower value be used in the Gulland (1968) yield formula: Y = 0.5 M Bo. Recruitment to the fishery for most species occurred by 3 years of age. The demersal fish stocks in Yemeni waters may not exceed 109×103 tonnes at the present time. Using a value for M of 0.3, the annual sustainable yield may be in the region of 16×103 tonnes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb04005.x
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  • 3
    Electronic Resource
    Electronic Resource
    Growth rates of Lutjanidae (snappers) in tropical Australian waters (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 26 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Growth rates of three commercial species of Lutjanidae were estimated from sections of vertebrae cross-checked with scales. The von Bertalanffy growth constants for Lutjanus malabaricus were K=0.168, L∞=70.7 cm standard length (S.L.). For Pristipomoides multidens these were K= 0.219, L∞= 59.1cm, and for Pristipomoides typus K=0.254, L∞= 51.5 cm. Length/weight was analysed in the form W= aLb where W was fresh weight (g) and L= S.L. (cm). The constants were: L. malabaricus, a= 0.041, b= 2.842; P. multidens, a=0.032, b= 2.897; P. typus, a= 0.038, b= 2.822. The growth rates were considered low in comparison with demersal fish counterparts from temperate seas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb04233.x
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