July 2011

Economic performance of crab fishery in Lagos lagoon, Nigeria

The study evaluates the economic performance of small-scale crab fishery operations in terms of economic indicators and success performance during 2009 and 2010 fishing season in five lagoon systems in Lagos state. The objectives of the study were to state economic viability of the crab fishing activity and to identify factors influencing the cost structure. Initial analysis reveals that a large variation in cost...

Author(s): O. A. Adeogun, B. B. Solarin, H. K. Ogunbadejo, E. E. Ambrose, O. R. Akinnigbagbe, A. A. Ajulo, Bolaji D. A., O. A. Olusola and M. O. Adeogun 

July 2012

Effect of repeated partial cropping on population dynamics and yield of Oreochromis niloticus (L.) during polyculture with Heterobranchus longifilis (Val.)

The effect of repeated cropping of half the number of young and large adults on productivity and dynamics of Oreochromis niloticus was investigated during polyculture with Heterobranchus longifilis. Mixed-sex, large-sized and young adult tilapia of 841±0.3 g and 841±0.23 g were cultured with 40 catfish fingerlings in triplicate 36 m2 earthen ponds in 1 and 2 treatments respectively. At...

Author(s): Chukwuma O. Ofor, Udo I. Udo and Michael O. Udoidiong

July 2011

Bioremediation of ammonia and nitrite in polluted water

High ammonia nitrogen is a key limiting factor in polluted waters or intensive aquaculture system. Removal of unionized ammonia (NH3) and nitrite (NO2) through biological activity is thus an important tool for changing such ecosystem. Nitrifying bacterial inoculants are the biologically active materials which may be used in intensive aquaculture for bioremediation. In all, 12 treatments were used with two replications...

Author(s): P. Barik, H. K. Vardia and S. B. Gupta

July 2011

Fatty oil composition of Osteobrama belangeri (Val.) from Manipur

The fatty oil content of Osteobrama belangeri and its chemical compositions were determined by the analysis of fatty acid methyl esters using gas chromatography (GC) and gas chromatography/mass spectrometry (GC-MS). A total of eighteen compounds were identified constituting about 96.1% and 96.7% of the crude head and body oils. Ten compounds were identified as major fatty acids in the oil and the main acids...

Author(s): Virendra Singh Rana, Basudha Devi and Maria AmparoBlazquez