Growth Determination of Selected Fish Species in River Hadejia, Jigawa State, Nigeria

Abstract

The work was designed to investigate the various ages of selected species of fishes in River Hadejia with the use of opercula and scales. The growth marks were laid annually. The growth rate did not exhibit Rosa Lees phenomenon. The asymptotic length Loo had higher values in the males than the females except in Tilapia Zilli from site B. K(rate at which Loo is approached) and to (time at which the fish would be zero sized) did not show any consistent pattern of difference between the sexes. Growth performance index (d) was similar for the different species and sexes in all the sites, S.D = 0.103. The places show the growth marks on the opercula bones and scales of some selected fishes.

Keywords: - Growth, Opercula, Scales, River