Research Papers/Topics in Fisheries and Aquaculture

Using Ulva (Chlorophyta) for the Production of Biomethane and Mitigation Against Coastal Acidification

In South Africa the green macroalga Ulva armoricana is the main species of macroalgae cultured. The species is currently the largest aquaculture (2884.61 tonnes) product by weight with a corresponding capacity for biogas (CH4) production. We have shown that biotransformation of U. armoricana to Liquefied Petroleum Gas (LPG) is viable and economically feasible as a clean fuel. pH toxicity tests showed that U. armoricana can be used as a health index, under potentially increased CO2 concentrati...

Determination Of Thermal Tolerance, Density And Distribution Of The Mangrove Crabs, Perisesarma Guttatum (Sesarmidae) And Uca Urvillei (Ocypodidae) At Gazi-Bay, Kenya

Abstract Mangrove crabs are important in ecosystem functioning including; bioturbation of the soil resulting in soil particle size distribution, sediment aeration, reduction in sediment salinity and nutrient recycling and thus are fundamental for the viability of mangrove forests which are in turn important to the coastal communities’ livelihoods. Mangroves are intertidal forested wetlands confined to the tropical and subtropical regions. They play important role as habitat for animals, pro...

Assessment of Genetic Structure of Clarias Gariepinus, Burchell, 1822 Population in Asejire Lake

Abstract Wild brood-stock is a major genetic reservoir for sustainable culture of Clarias gariepinus. This has been observed to be declining in major freshwater dams in Nigeria. There is inadequate information on factors responsible for this decline and their effects on genetic structuring of the fish resources in these dams. This study therefore investigated genetic structure of C. gariepinus in relation to environmental condition of Asejire Dam.    The Dam was spatially divided into Oyo...

Economic Efficiency Of Fishing Among Marine And Lagoon Artisanal Fisherfolks In Lagos State, Nigeria

ABSTRACT Fishing is a major source of livelihood for rural and peri-urban communities along coastal waters. The operation of artisanal fisherfolks is threatened by increasing overfishing of inshore waters, inadequate credit facilities, insufficient fishing input subsidies and inadequate extension services. These had negative implications on their efficiency hence their well-being.  In order to enhance their performance, the efficiency of the fisherfolks, profitability and challenges were ex...

Assessment Of Trace Metals Pollution Along The Central Namibian Marine Coastline: Using Choromytilus Meridionalis (Black Mussel) As Indicator Organisms

ABSTRACT This study was carried out at four stations along the Central Namibian marine coastline towns (Walvis Bay, Swakopmund, Henties Bay and Cape Cross) to assess trace metals pollution using Choromytilus meridionalis as indicator organism. Samples were collected using randomized sampling techniques during winter and summer months of 2012. EPA 3050B and ICP-OES protocols were used to digest and assimilate the samples. Data were analysed using a 4x2x3 factorial model of a completely random...

Stock Separation Of The Shallow-Water Hake Merluccius Capensis In The Benguela Using Otolith Shape Analysis And Parasite Infestation

Abstract The fishing industry is an important sector in Namibia with hake contributing about one third of the total commercial catch. Merluccius capensis, the shallow water hake, forms the bulk of this resource. Studies on the distribution of spawners and juveniles, spawning areas and genetics have proposed three stock structure hypotheses of M. capensis in the Benguela: (1) one stock throughout, (2) one in the northern and one in the southern Benguela or (3) three stocks: one in the norther...

Analysis Of Marine Biotoxins: Paralytic And Lipophilic Shellfish Toxins In Mussels (Mytilus Galloprovincialis) Along The Namibian Coastline

Abstract The study was carried out along the Namibian coastline, this includes Henties Bay, Swakopmund, Bird Island, Walvis Bay and Lüderitz to assess presence of shellfish marine biotoxins in mussels, Mytilus galloprovincialis which are filter feeders and feed on some of the algal species that produces phycotoxins, that can negatively affect the mariculture industry and human health. Samples were analysed for Paralytic and lipophilic shellfish toxins; including environmental parameters and ...

Trophic Relationships Of Shallow Water Cape Hake (Merluccius Capensis) And Cape Horse Mackerel (Trachurus Capensis) In The Northern Benguela Ecosystem

ABSTRACT Shallow water Cape hake (Merluccius capensis) and Cape horse mackerel (Trachurus capensis) are ecologically and commercially important species in the northern Benguela ecosystem (Namibia). The understanding of their trophic relationships is however still limited. In this study stable isotope measurements [carbon (δ13C) and nitrogen (δ15N)] of their muscles and stomach contents were used to investigate their feeding interactions. Understanding the feeding interactions of these two s...

Ecto- And Endo-Parasites Of Silver Kob (Argyrosomus Inodorus) From Northern Namibia (21° - 24°S)

Abstract The silver kob (Argyrosomus inodorus) has been identified as a candidate species for finfish culture due to its outstanding qualities. There is little information available on the health of this species, especially parasite infestation that can pose a threat to fish cultivation and therefore to the success of mariculture. This study was thus designed to provide information on parasites that are affecting this species. Silver kob were collected monthly (2017–2018 for 11 months) usin...

Evaluation of nile tilapia (oreochromis niloticus, linnaeus 1758) fingerling production at the aquaculture demonstration centre - ashaiman, ghana.

ABSTRACT The Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) fingerling production is important for the continual expansion of the global tilapia aquaculture. This study evaluated the Akosombo Strain Nile tilapia fingerling production at the Aquaculture Demonstration CentreAshaiman, Ghana. A total of 1350 female brooders of mean weight 150.7±41.8 g and 450 males of mean weight 218.6±63.1 g were stocked into nine outdoor concrete tanks of size 50 m2 each in a sex ratio of 3:1 respectiv...

Growth Performance Of Clarias Gariepinus Juveniles Fed Processed Almond (Terminalia Catappa Linnaeus) Kernel Meal

ABSTRACT Increasing cost of feedstuff due to competition between livestock and human necessitates research into Low-Cost Unconventional Feedstuffs (LCUF) for profitable fish farming. Almond kernel has been reported to be nutrient-rich feedstuff for livestock; however information on the potential of almond (Terminalia catappa) as a LCUF has not been well documented in aquaculture. Therefore, the use of almond kernel meal as a replacement for soybean meal in the diet of Clarias gariepinus was i...

Effect Of Pawpaw (Carica Papaya) Seed Meal On Growth Performance, Feed Utilization, Survival And Masculinization Of Sexually Undifferentiated Three Spotted Tilapia (Oreochromis Andersonii) Fr

ABSTRACT The objective of this study was to determine the effects of dietary Carica papaya seed meal supplementation at different levels on growth performance, feed utilization, survival rate and sex ratio of sexually undifferentiated three spotted tilapia (Oreochromis andersonii) fry. Six treatments (replicated thrice) were designed based on the control (basal diet), 17 α-methyltestosterone (MT) (60 mg) and C. papaya seed meal incorporated into tilapia feed at 5, 15, 25 and 35 g / kg diet ...

Livelihood Diversification Of Fisherfolks In Communities Around Oyan And Ikere Gorge Dams, South Western Nigeria

ABSTRACT Fishing as the main source of livelihood by artisanal fisherfolks is declining due to climatic changes and over exploitation. Fishing income can no longer meet fisherfolks‟s needs. Alternative sources of livelihood in addition to fishing are now being explored by fisherfolks. However, information on livelihood diversification in Oyan and Ikere Gorge has not been adequately documented. Therefore, livelihood diversification of fisherfolks around Oyan and Ikere Gorge reservoirs in Ogu...

GROWTH PERFORMANCE OF FRY AND FINGERLINGS OF OREOCHROMIS NILOTICUS FED ON DIFFERENT AGRO-INDUSTRIAL BY-PRODUCTS

ABSTRACT The study was conducted at the Aquaculture Research and Development Centre at Akosombo to observe the growth performance of fry and fingerlings of O. niloticus; and also assess the cost-effectiveness of the different dietary treatments. In experiment 1, four isonitrogenous (36% crude protein) and isoenergetic (gross energy 18 MJ/kg) diets were formulated to contain agro-industrial by-products including: wheat bran (diet 1), pito mash (diet 2), rice bran (diet 3) and groundnut bran (d...

ASSESSMENT OF AQUATIC ECOSYSTEMS, THE FISHERY AND SOCIO-ECONOMICS OF A COASTAL AREA IN THE SHAMA DISTRICT, GHANA

ABSTRACT The study provides requisite scientific and socio-economic data for sustainable management of the fishery and aquatic ecosystems at Anlo Beach in the Shama District, Ghana. Physico-chemical conditions, macrozoobenthic fauna, and the fish and fishery characteristics of River Pra Estuary, the associated wetlands and marine waters were studied from February 2012 to December 2013. Economics of the fishery, governance and other livelihood activities were also investigated. Data were part...


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