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Intraspecific morphological variation in the wild penaeid shrimps was studied in four estuarine and two shallow–water study sites in Malindi–Ungwana Bay. Three morphometric characteristics, body length, carapace length and total length describing shape of penaeid shrimps were used. Total length, the explanatory variable, brings out significant information in shrimps, while groups of population that varied significantly in terms of morphometric variations were easily differentiated (P < 0.05) across the sample stations. Generally, Principle Component Analysis dimensions for all shrimps except the Penaeus canaliculatus indicated an inversely correlation between body length and carapace length and a good correlation of carapace length and total length. Several species displayed intraspecific morphological variability where shape variations increased with size and postlarva were closer to each other than adults along the first axis of Principle Component Analysis. The present study concludes that the variability among individual species within each population indicates the presence of high genetic diversity among the populations of different shrimps that give rise to genetically panmictic populations within the Malindi–Ungwana Bay.

Morphometric variations among populations of the wild Penaeid shrimps in Malindi–Ungwana Bay along the Northern Coast of Kenya