PAPER TITLE :DIVERSITY AND CONDITION FACTOR OF FISH SPECIES OF IKPA RIVER AT NWANIBA IN NIGER DELTA, NIGERIA

FUTA JOURNAL OF RESEARCH IN SCIENCE | VOLUME 8 NUMBER 2 2012

Paper Details

  • Author(s) : I. E. Ekpo
  • Abstract:

Fish specimens sampled from Nwaniba (Ikpa River) for 12 calendar months (March 2009 – February 2010)
comprised 11 orders, 33 families, 59 genera and 136 species; making a total of 2307 specimens. During the
dry season, Papyrocranus afer had the lowest (0.32) condition factor (K) value while the highest was
Tilapia zillii (3.28). During the wet season, Sphyraena afra (0.37) had the least K while T. mariae (3.88)
was the species with the highest K value. Fish annual condition factor (K) values ranged from 0.40 in
Caranx senegalensis to 3.43 in T. zillii while the mean monthly condition varied from 0.07 (P. afer) in
October to 4.22 (T. mariae) in April. Shannon-Wiener biotic index varied from 0.29 being the lowest in
September to 2.79 being the highest in May. Seasonal variation in the index showed highest (2.15) during
dry season than the wet season (0.67). Species richness was high (136) indicating a polydiversed
community. Previous studies showed that T. mariae had a mean K value of 3.8 but 2.81 in the present study
in the same system. Higher K value of 1.66 was obtained for B. nurse but previously was 0.34. These
differences may be occasioned by the human anthropogenic perturbations which are on-going in the river
system, thus leading to environmental degradation. Therefore, appropriate recommendations were
proffered.
Keywords: diversity, piscine, condition factor, Ikpa River, Nwaniba.