Monthly spatial occurrence of phytoplankton and zooplankton in River Ogun, Abeokuta, Ogun State, Southwest Nigeria
The aim of this study was to investigate the monthly spatial occurrence of phytoplankton and zooplankton in River Ogun, Abeokuta, Southwest Nigeria. This was carried out for seven months between December, 2011 and June, 2012 in 4 stations. A total of 41 species of phytoplankton and 16 zooplankton species from 5 classes respectively were recorded. Zooplankton was dominated by Cladocera throughout the study period while...
Effect of different stocking densities on growth performance and profitability of Oreochromis niloticus fry reared in hapa-in-pond system
A one month trial of sex reversal treatment of O. niloticus fry of varying stocking densities was performed in hapas-in-pond to determine the growth performance characteristics and profitability. Larvae were selected, collected, weighed and stocked inside a 10.0 m2 hapas in a 0.2 ha pond with stocking densities of 10000 (A), 15000 (B) and 20000 (C). Each stocking were made in triplicate. Fry were...
A new species of Tylocephalum (Cestode: Lecanicephalide, Braun, 1900) from marine fish at Ratnagiri, India
The present investigation deals with systematic observation of the cestode parasitesTylocephalum Linton, 1890, that is, T. damodarae n.sp. of marine fish Dasyatis walga Muller and Henle, 1841 from West Coast of Maharashtra which is most pathogenic. The present worm comes closer to all the known species of the genus Tylocephalum in general topography of organ but differs due to...
Gill arch occupation models of parasite communities of Barbus martorelli (Teleostean: Cyprinidae)
Changes in Barbus martorelli gill arch occupation models by its parasite component community were investigated for nine months. The work revealed three different categories of models. The first category follows the combined action of the respiratory water current and the colonized surface of each gill arch. The second category based on the mode of infestation of Monopisthocotylean larvae while the third...