Fisheries and Aquaculture Research Papers/Topics

Assessment of fish farmer’s vulnerability to climate variability and extreme climate events in selected parts of Kitui county, Kenya

Abstract: Fish farmers are a vulnerable group to climate variability and extreme climate events effects as their production heavily relies on precipitation and temperature. However, previous studies on vulnerability of fish farmers to climate variability and extreme events have been done on global, regional and national scales, thus failing to capture the local realities on spatial variability. The current study was carried out to assess the householdlevel vulnerability of fish farmers to cl...

Distribution habitat use and behaviour of cetaceans in the Greater Dyer Island area Western Cape South Africa

Abstract: This thesis is a study of the occurrence, behaviour, spatial distribution, and temporal distribution of cetaceans in the Greater Dyer Island area, Western Cape, South Africa. Three main methods were used in the study: Analysis of data from a local whale-watching vessel (WWV) (2000 2012), visual land-based theodolite tracking (during four southern right whale seasons (August December) from 2011 2014 and one summer/autumn season in 2013), and passive acoustic monitoring (PAM) using a...

The Distribution of cetaceans off the coast of South Africa and South West Africa / Namibia

Abstract: Thirty - seven species of cetacean are recorded from southern African waters. Four thousand, five hundred and thirty - seven records of approximately 60 000 cetaceans were analysed to defme distribution patterns of these species, including dedicated sightings (both scientific and commercial), incidental sightings, commercial catches and specimens. Records of dedicated scientific sightings and incidental sightings were analysed by water depth, sea surface temperature and salinity an...

Abundance and predatory impact of killer whales at Marion Island

Abstract: Killer whales are the oceans’ apex predator and are known to have important effects on ecosystems. At Subantarctic Marion Island, southern Indian Ocean, they have only been studied opportunistically, resulting in limited knowledge of their ecosystem impact here. This dissertation describes the prey and seasonal abundance, estimates the population size and assesses the predatory impact of killer whales on seals and penguins at Marion Island, using dedicated and opportunistic shore...

BEEF CATTLE VALUE CHAIN ANALYSIS IN BORA AND DUGDA DISTRICTS, OROMIA REGIONAL STATE, ETHIOPIA

Abstract: This study was aimed at analyzing beef cattle value chain in Bora and Dugda districts, Oromia Regional State, Ethiopia. The specific objectives of the study were to:- identify major beef cattle value chain actors and their roles in beef cattle value chain in the study areas; Identify the major constraints and opportunities in beef cattle value chain; analyzing the determinants of smallholders farmers' market participation decision and quantity of beef cattle supplied to the market ...

FISHERMEN’S WILLINGNESS TO PAY FOR FISHERIES MANAGEMENT: THE CASE OF LAKE ZEWAY, ETHIOPIA

Abstract: Lake Zeway fishery is threatened with problems of overexploitation and consequently unrecovered resources resulting in loss of its potentials due to mismanagement. This study identified the determinants of fishermen’s willingness to pay for fishery management and measured mean fishermen’s willingness to pay for lake Zeway fishery management. A two-stage random sampling techniques was applied to identify sample fishermen’s from Adami Tulu Gido Kombolcha, Zeway Dugda and Dugda ...

ANALYSIS OF FACTORS AFFECTING FISH CATCH LEVELS FROM LAKE TANA, ETHIOPIA

Abstract: Agriculture plays vital role in Ethiopian economy. However, despite its importance and potential, the sector has remained at subsistence level. One of the traditional sources of animal protein of the developing world is through livestock rearing. Unfortunately, the livestock production is under increasing pressure from the combined effects of human population growth, shortage of grazing land and desertification. Therefore, it is important to look for a better and cheap, alternative...

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...

Moving Toward Sustainable Aquaculture for Rural Sustainability and Development in Kenya. A Case of Vihiga County

Kenya has a tremendous great potential for growth in the aquaculture sector. To attain the sustainable development goal of zero hunger, the government is needed to encourage fish culture among the rural communities. The study's objective is to investigate the elements that affect the sustainable development of fresh water Aquaculture in Kenya a Vihiga County case. The purpose of the research is to determine how production characteristics and extension affect the long-term sustainability of fr...

A Comparison of the Growth of the Nile Tilapia (Oreochromis Niloticus, Linnaeus, 1758) Fingerlings Fed with Blue Crown® And Skretting® Commercial Feeds

ABSTRACTA comparison of the growth of the Nile tilapia (Oreochromis niloticus)fingerlings fed with Blue crown® and Skretting® commercial feeds was studiedfor a period of 8 weeks. A total of sixty fingerlings of Oreochromis niloticuswere used. The treatments showed significant difference (p0.05)between   the   two   feeds.  Some   water   quality   parameters   assessed   during   theexperiment indicated that only the dissolved oxygen was significantly differentbetween the two treatments (p

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...

Nutrient Composition of Trachurus trachurus (Atlantic Horse Mackerel) Smoked With Sawdust and Different Fire Woods (Dialium guineensis AND Pentaclethra macrophylla)

ABSTRACT Trachurus trachurus (Atlantic horse mackerel) was smoked with two different fire woods Di'alium guineensis and Pentaclethra macrohylla and sawdust using a traditional smoking kiln and a constructed sawdust stove sited in the fish farm of Michael Okpara University of agriculture Umudike. The frozen fish sample was weighed, eviscerated and washed properly with clean water. During smoking the temperature of the heat was taken, duration of smoking period was also noted in smoking p...

Chemical Analysis and Nutritional Assessment of Artocarpus heterophyllus Lam. (Jack Fruit) Defatted Seeds used as Additive in Feed for Clarias gariepinus post juveniles

Abstract A 49-day feeding trial was carried out with feeds supplemented with microgram quantities of the defatted seeds of Artocarpus heterophyllus in the diets of Clarias gariepinus at the post juveinile stage. Five diets at 40% crude protein were formulated containing 0, 15, 30, 45 and 60x106 µg DAH seed as additive. Each dietary treatment was replicated three times with 10 fish per replicate. Proximate composition of the defatted seed showed that it was rich in protein, carbohydrate and ...

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...


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