ABSTRACT Studies on aspects of the biology of the Nile tilapia (Oreochromis niloticus L.) were undertaken in a man-made lake, the Weija reservoir in Ghana from September 2007 to August 2008. A total of 657 specimens of O. niloticus from commercial landings were examined of which 357 were males and 300 were females (sex ratio of 1: 0.84; P < 0.05). GSI was low in December 2007 and August 2008 and highest in March and May 2008. Fluctuations in the GSI, suggested that O. niloticus spawned thro...
ABSTRACT High cost of conventional feedstuffs and competition between livestock and fish for ingredients necessitate research into low cost, non-conventional feedstuffs for profitable fish farming. In aquaculture, the emphasis is on producing feeds that promote growth and health of fish. There is scanty documentation of the potential of onion (Allium cepa) bulbs and walnut (Tetracarpidium conophorum) leaves in fish production. The growth performance of Clarias gariepinus on diets containing ...
ABSTRACT The study investigated whether progeny of Sarotherodon melanotheron from two different populations would have higher reproductive capacity and also exhibit desirable aquaculture traits. Broodstock of S. melanotheron were collected from Kakum Estuary and Benya lagoon and bred to the second filial generation stage. Reproduction was higher in the parents from the Estuary than those from the lagoon. Water quality parameters were within the acceptable range for fish culture. Three diffe...
ABSTRACT Aspects of the ecology and spatial context of Etse Lagoon at Abandze, in the Central Region of Ghana were studied from April 2014 and March 2015. Water temperature ranged from 24.0 ⁰C to 36.6 ⁰C (mean = 29.43 ± 0.12 ⁰C). Salinity varied from 0.72 ‰ to 22.30 ‰ (mean = 13.42 ± 0.30 ‰), pH from 4.6 to 8.9 with a mean value of 7.6 ± 0.03, DO from 1.65 mg/l to 11.15 mg/l with a mean value of 5.08 ± 0.08 mg/l and conductivity from 7.35 mS/cm to 43.3 mS/cm with a mean value...
ABSTRACT The current study evaluated growth performance, survival rate, feed conversion ratio, heterosis, heritability, responses to selection and breeding values of four populations of Sarotherodon melanotheron from Fosu Lagoon, Brimsu, Baifikrom and Weija reservoirs in 4 × 4 diallel crosses aimed at producing a hybrid with high growth, reproductive and survival traits to enhance aquaculture production. Triplicates of a single-pair mating design for the diallel crosses yielded 3,840 fingerl...
INTRODUCTION Aquaculture is one of the fastest growing food producing sectors in Agriculture and fish is among the most traded food commodities world-wide accounting for 17 per cent of global intake of animal protein (Food and Agricultural Organization, 2014). Fish is an aquatic and a source of high-quality animal protein that could be harvested from capture or culture fishery (Olele et al., 2008). Fisheries expert needs a medium where they can culture fish in a confined and controlled envi...
AQUATIC ECOLOGICAL SURVEY INTRODUCTION An aquatic ecological survey can be referred to as the backbone of Fisheries, and the process of planning can be referred to as a survey, according to a popular saying “he who fails to plan, plan to fail”. The aquatic ecological survey deals with proper planning in both capture and culture fisheries; planning (survey) in capture fisheries involve the use of a sophisticated instrument to check the aquatic resources of economi...
Glyphosate (N-phosphonomethyl glycine) is a broad spectrum systemic herbicide used extensively in weed control. The present study was designed to evaluate the toxicity effect of glyphosate on 300 post juveniles (50g±0.96g; 22cm±0.02) of Clarias gariepinus (Burchell, 1822) after exposure to acute concentration levels of 31, 33, 35, 37 and 39 mg glyphosate/L of clean water. The experiment was completely randomized as each treatment were all replicated thrice. Glyphosate toxicity (96 hr LC50) ...