Contributions to the biology of penaeid prawns in Lake Manzalah,Egypt. I. Growth studies and length-weight relationship |
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| Authors: | Nabila F Bishara |
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| Institution: | Institute of Oceanography and Fisheries, Kayed-Bey, Alexandria Egypt |
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| Abstract: | Some aspects of the biometrics of Metapenaeus stebbingi, M. monoceros and Penaeus trisulcatus in the brackishwater Lake Manzalah are studied.M. stebbingi dominated the catch all over the lake from December 1966 to June 1967 followed by M. monoceros. The lowest percentage was that of P. trisulcatus which dominated the catch in the northeastern and western parts of the lake in the period September–December. M. monoceros dominated the catch in the northwestern area in the same period. The relation of this distribution to the nature of the lake bottom, chemical composition of the sediment and salinity variations are discussed.Age and growth studies showed that P. trisulcatus has an average monthly growth of 10 mm, and that the fishery is supported by the 0-year class. For M. monoceros an approximate growth of 5 mm/month was observed and it was concluded that the 2-year age group supported the fishery of this species.For M. stebbingi an approximate growth rate of 2–4 mm/month was observed and it was concluded that the I+ and II+ age groups constitute the catch.The growth studies show that P. trisulcatus and M. monoceros spawn during spring, while the peak of the spawning season for M. stebbingi is in the autumn. A close relationship was found between the seasonal variations in the rate of increase of prawn weight and the spawning season.The study included the distribution of the different species and length groups in the different parts of the lake. |
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