Length-weight parameters and condition factor of two West African prawns [Nematopalaemon hastatus, Macrobrachium macrobrachion; Cross River]

agua salobre biometria biometrie biometry brackish water crevette environmental factors estuaire estuaries estuarios facteur du milieu factores ambientales fishery resources gambas y camarones largura length longueur macrobrachium nigeria peso poids prawns and shrimps recursos pesqueros ressource halieutique weight