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Articles by P.E. Anyanwu
Total Records ( 6 ) for P.E. Anyanwu
  P.E. Anyanwu , O.A. Ayinla , B.I. Ebonwu , I.K. Ayaobu-Cookey , M.B. Hamzat , A.F. Ihimekpen , M.A. Matanmi , E.S. Afolabi , M.R. Ajijo and B.L. Olaluwoye
  The Black Tiger shrimp, Penaeus monodon is a new entrant in the Gulf of Guinea along the West African coast. The species though not native to the region has been well established. In Nigerian coastal waters for example, fishing trawlers and local fishermen catch berried females all year round and thus can serve as sources of broodstock supply for aquaculture purposes. Preliminary studies by Nigerian Institute for Oceanography and Marine Research on shrimp broodstock availability, collection, breeding, post larvae production and grow-out indicated that there are great potentials for commercial culture of the species in the country. However major challenges included scarcity of post larvae for stocking, power outages, lack of technical know-how and negative environmental impacts. The prospects and challenges of shrimp farming in Nigeria are highlighted.
  O.A. Ayinla , P.E. Anyanwu , A.F. Ihimekpen , B.I. Ebonwu , I.K. Ayaobu-Cookey , M.B. Hamzat , M.A. Matanmi , E.S. Afolabi , B.L. Olaluwoye and M.R. Ajijo
  Culture trial of the Tiger Shrimp (Penaeus monodon) was carried out in one of the grow-out concrete tanks at Nigerian Institute for Oceanography and Marine Research, Victoria Island, Lagos. A total of 264 post larvae of P. monodon (PL 30) produced at the Institute’s shrimp hatchery complex were used for the experiment which lasted for 157 days. Coppens Catco feed of 0.8-1.2 mm size was used to feed the post larvae throughout the duration of the experiment. The results showed that the shrimps grew from an initial mean body weight of 1.763±0.647 g at stocking to 19.538±2.293 g at the end of the experiment. The daily growth rate was 0.113 g day-1 while specific growth rate was 1.532%. Food Conversion Ratio (FCR) was 3.36 while survival rate was 90%. The study has shown that P. monodon can be successfully cultured in concrete tanks. However, further studies aimed at improving growth rate will be undertaken.
  C.B. Okoro , P.E. Anyanwu , A.O. Anyanwu and P.C.J. Anyanwu
  The operational costs and revenue generation of a catfish farm operating water recirculation system was analyzed from May 2007 to April 2008. The farm operated the Dutch Model system with annual capacity of 30 t of African catfish for grow-out facility. It had a small hatchery using water flow-through system. Total operational cost for 12 months period was 1,058,288.00 ranging from 48,400 to 116,850.00 monthly. Similarly, total revenue generated was 1,66,220.00 with a monthly range of 33,670.00 to 68,890.00. The gross profit for the period of study was 107,932.00 which was very minimal. The highest expenditure item was salaries accounting for 34% followed by fish feed which accounted for 32% of the total costs. The catfish farm was not operating at full capacity at the time of this study. However the analysis has highlighted that payment of salaries and feed procurement were major expenditure items that will determine the profitability of this investment. Consequently, reduction in salaries and feed costs will reduce the operational costs and thus make the project more viable.
  P.E. Anyanwu , A.F. Ihimekpen , P.C. Pepple , B.I. Ebonwu , M.B. Hamzat , I.K. Ayaobu-Cookey , M.A. Matanmi , E.S. Afolabi , M.R. Ajijo , G.O. Ikoyo-Eweto and M.M. Abdullahi
  Gravid female broodstock of Macrobrachium vollenhovenii were collected from Ogun River. Their body weight ranged from 17.2, 22.4 and 17.4 g, while the total length ranged from 9.7-11.7 cm. The broodstock were stocked in three plastic tanks and allowed to spawn naturally. Three spent female broodstock were stocked separately in plastic tanks containing 6 L of freshwater. They were fed trash fish twice daily at 5% body weight. The spent females started to develop eggs again in 21 days with full maturation at 35 days. The body weight after 35 days ranged from of 8.5-24.1 g while the total length ranged from 11.4-11.9 cm. The result obtained have shown that spent female broodstock of M. vollenhovenili can become gravid again in plastic tanks in 35 days when fed fresh trash fish. This will ensure all year round production of broodstock for development of M. vollenhovenii.
  P.E. Anyanwu , I.K. Ayaobu-Cookey , B.I. Ebonwu , M.B. Hamzat , P.C.G. Pepple , A.F. Ihimekpen , M.A. Matanmi , G.O. Ikoyo-Eweto , E.S. Afolabi , M.A. Abass , B.L. Benson , M.R. Ajijo , M.M. Abdullahi , N.M. Achilike and A.S. Tafida
  A total of 457 broodstock and 143,000 juveniles of Macrobrachium vollenhovenii were collected at Isheri Olofin area and Okunmanya River over a period of time. They were transported live to the Shrimp hatchery of Nigerian Institute for Oceanography and Marine Research (NIOMR) in Victoria Island Lagos. Live transportation of the broodstock of M. vollenhovenii with body weight ranging from 71.0-264.5 g in 50 L capacity plastic containers half filled with water recorded 98-100% survival rate between 80-110 min transportation time. However, live transportation of the juveniles in 50 L capacity plastic containers without water recorded survival rates ranging from 20-66% while those carried with water and aerated recorded 12.5-93.75%. An air conditioned vehicle was used during the live transport. Higher mortality rates were recorded for the juveniles than the broodstock due the large numbers transported in addition to the small-sized gear used for trapping the juveniles. The study has developed a simple technology for collection and transportation of live specimens of broodstock and juveniles of M. vollenhovenii. Efforts will be made to increase survival of the juveniles through use of larger containers and gears.
  E.P. Anwa-Udondiah , P.E. Anyanwu and I.A. Akintayo
  Climate change has the potential to severely impact coastal and inland environments and ecosystems and by extension fisheries and aquaculture. Coastal regions of the world are already experiencing flooding due to rise in sea level. In recent times, salinization of coastal areas due to flooding from storm surges and high tidal influence has been observed. Aquaculture is a fast growing agri-business venture in Nigeria presently and many coastal communities derive their livelihood from it. The culture of fresh water fish species that are very sensitive to high salinity may be threatened leading to mortality of stocked fish and loss of livelihood for coastal population. Consequently, there is urgent need for development and domestication of the silver catfish Chrysichthys nigrodigitatus that can tolerate higher salinity more than mudcatfish (Clarias gariepinus). This will help mitigate the impact of salinization of coastal areas arising from sea water flooding on culture of fresh water fish species.
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