The abundance and distribution of some shellfishes of the coastal waters bordering Ayetoro, Bijimi, Asumogha and Idiogba of Ondo States, Nigeria was studied between September and December, 2011. Specimens were collected monthly with the assistance of artisanal fishermen. The population structure and distribution patterns were determined using Margalefâ€™s diversity index, Sorensenâ€™s index, and Number of Occurrence Index (NOI). Nematopalaemon hastatus, Farfantepenaeus notialis, Parapenaeopsis atlantica
and Portunus validus
occurred at the four sampling stations throughout the sampling period. Macrobrachium macrobrachion
was not caught in December whileCallinectes marginata
and Ocypode africana
were caught once during the sampling period. In September, N. hastatus
was dominant in the four locations with 83.05%, 76.47%, 72.50% and 71.67%, in Ayetoro, Idiogba, Asumogha and Bijimi respectively. In Asumogha in October, N. hastatus
had 71.93%, F. notialis
17.54%, P. atlantica
7.89%. while P. validus
had 2.64% NOI. 207 specimens were captured from Idiogba in November and N. hastatus
had 86.96% NOI. The diversity index (d
) ranged from 0.38 at Idiogba to 0.91 at Asumogha in December and September respectively, while Sorensenâ€™s similarity (Cs
) values ranged from 0.38 to 0.5. The study revealed that there was a generally high similarity among the shellfish communities in the four sampling stations.
Coastal waters of Ondo State
Olawusi-Peters O.O, Ajibare AO. Species abundance and distribution patterns of some shellfishes in coastal waters of Ondo State, South West, Nigeria. Int. J. Fauna Biol. Stud. 2014;1(4):19-24.