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Mariculture development in the People's Democratic Republic of Yemen







Querellou, J. Oct 1980. Mariculture development in the People's Democratic Republic of Yemen. Rome (Italy). 41 p.


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    Report on the socio-economic aspects of the Gulf of Aden fisheries in the People’s Democratic Republic of Yemen 1979
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    According to the project document, the immediate objective are to aim at improving fishery production in the participating countries to benefit small scale fisheries and at developing the industrial potential; to prepare the ground, identify the means and initiate the reactivation and expansion of the existing marine fisheries and thereby to preserve the fishing communities; and to plan and, where appropriate, design and initiate investment-oriented development schemes. To survey the socio-econo mic aspects of the Red Sea fishing communities in the People's Democratic Republic of Yemen, various visits were arranged to these groups along the coast.
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    Second report of mesh selection studies conducted in the People's Democratic Republic of Yemen on the cuttlefish Sepia pharaonis 1982
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    This paper describes a repeat of an earlier study by the authors, concerning the mesh selection properties of trawl cod-ends of various mesh sizes on the cuttlefish Sepia pharaonic. A brief resume of the findings is as follows: the estimated 50% selection lengths with 95% confidence limits for single braided polyethylene cod-ends of 12.4 cm, 13.6 cm and 16.8 cm mesh sizes were 17.87+0.28 cm, 20.74+- 0.53 cm and 26.95+-1.07 cm; the 50% selection lengths and selection ranges were very similar to t hose obtained in the earlier study in respect to the 12.4 cm cod-end, but higher in respect to the 13.6 cm cod-end; the 16.8 cm cod-end had not been previously used; the previously held assumption that the 50% selection lengths and cod-end mesh sizes were proportionally related was seen as inappropriate, and hence also the estimation of selection factors; the more appropriate relationship was seen to be one of non-proportional linearity, and the regression equation considered most compatible wit h the observations as 50% selection length (cm)=2.03 mesh size(cm) -7.41; for a chosen value of the 50% selection length, this equation gives substantially different values for the choice of appropriate cod-end mesh size, than the selection factors estimated from the earlier study.

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