Abstract Chronic stress is a serious threat to aquaculture as it lowers fish growth performance and compromises fish welfare. The exact mechanism by which growth is retarded is, however, not clearly understood. This study sought to elucidate the gene expression profiles associated with chronic stress in cultured Nile tilapia (Oreochromis niloticus) reared for 70 days at different ammonia concentrations and stocking densities. Fish in the treatment groups showed negative growth, while the con...
Abstract In the recent past, fish farming has gained great prominence in Kenya as the country straggles to meet food security. Nile tilapia (Oreochromis niloticus L.) farming has attracted the most demand, with the use of manure to enhance primary productivity in fish ponds being encouraged as a form of increasing productivity and returns on investment. The objective of this study was to understand the role of Nile tilapia farming in greenhouse emissions (GHGEs) in the region. Generally, the...
Abstract Fisheries are important sources of livelihoods to coastal communities. In the tropics fishing is conducted from mangroves, seagrass meadows to coral reefs. Studies on fisheries in the tropics have focused on coral reef fisheries, with little attention to seagrass meadows and mangroves. Using creel survey and indepth interviews, this study assessed species composition, abundance and exploitation methods of fisheries from the seagrass meadows of Gazi Bay, Kenya. Eighty-five species we...
Abstract/Overview This study aimed at estimating the Phytoplankton quotients; Bay, and to determine eutrophic levels of the bay. The study was conducted from April 2009 to April 2010. Nutrients and phytoplankton analyses were determined by spectrophotometric and microscopic techniques, respectively. Significantly higher (p
ABSTRACT The study was conducted in four fish landing sampling stations along the southern coastline of Ghana, namely: Vodzah and Denu (both in the Volta Region) as well as Jamestown and Tema (both in the Greater Accra Region) from June, 2014 to January, 2015. The purpose of the study was to assess the security of coastal fishing operations in Ghana from three main perspectives, namely safety, poverty and fish catches. Data was obtained from both primary sources (field data) and grey literat...
ABSTRACT Shoreline change is an issue of concern to most coastal managers because the coastal zone is home to over 60% of the world’s population. In Ghana, shoreline change has been associated with loss of economic lands and properties. Previous researches have shown that the Ghana coastline is eroding at variable rates; the Eastern and Central Zones are receding while the Western zone is thought of as stable. This opinion, however, contrasts field observations and interview with local coa...
CHAPTER ONE 1.0 GENERAL INTRODUCTION 1.1 Background Fish and fisheries products serve as significant sources of food and incomes for numerous people, particularly those from developing countries (FAO, 2018). Fish is highly nutritious, containing approximately 70-84% water; 15-24% protein; 0.1-22% fat; 1-2%, minerals; 0.5% calcium; 0.25% phosphorus; and 0.1% vitamins A, D, B and C (Abraha, et al., 2018). Consumption of fish and fisheries products has been known to reduce the risks of cardio...
ABSTRACT The Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) forms about 80% of farmed fish in Ghana. However, the unavailability of its seed all year round for culture is a major constraint. This study evaluated the effects of varying male to female broodstock pairing ratios of 1:1, 1:2 and 1:3 with resting intervals of 0, 3 and 7 days on fry production performance of the Akosombo strain of the Nile tilapia at the Ashaiman Aquaculture Demonstration Centre, Ghana. Nine (9) treatments we...
ABSTRACT Marine pollution is one of the main anthropogenic factors identified globally to affect the estuarine and coastal ecosystems. One of the recipients of pollutants is the mangroves since they are intercepting between land and ocean. In recent years, the mangrove forests have been proposed for use as natural wastewater treatment wetlands. This is based on research findings conducted in countries like China. However, before promoting the use of natural mangrove as pollution buffers, the ...
ABSTRACT In Kenya, fish farming has been expanding in recent years, with Government support through financial and input subsidies to small scale farmers. The sub sector generates a variety of benefits such as food and nutrition and develops trade. However, the sub sector faces the challenges of fish diseases, given that the fish production facilities support high-density living conditions that are favorable for spread of parasitic diseases. Besides, when fish that is infected is consumed by h...
ABSTRACT Nile tilapia (Oreochromis niloticus) culture in Kenya is mainly conducted in low input ponds where supplementary feed is given alongside pond fertilization. Excess nutrients in the culture water in form of nitrogen (N) and phosphorus (P) may make the culture environment susceptible to invasion by disease-causing microorganisms. In the recent past, probiotics have received much attention as a new strategy in fish health management and have been documented to improve fish growth p...
ABSTRACT The hydro-biology of the Black Volta near the Bui dam were studied in relation to fish production as measured by catch per unit effort (CPUE) during the pre- and post-impoundment periods between February 2011 and December 2012. The primary objective was to assess the ecological impacts of the dam on the hydro-biological factors and fish production and provide data for monitoring the hydro-biology and fisheries of the Bui reservoir. Two sampling stations at Bui and Bamboi were select...
ABSTRACT The study was conducted to evaluate the nutritional composition through analysis of wild and hormone treated Nile Tilapia, Oreochromis niloticus. The fifteen samples of each wild and sex reversed were measured. The mean weight of wild species samples were (225.9 ± 19.9 g), while sex reversed samples were (169.9±46.3 g) with, significant difference (𝑝 < 0.05). The result of chemical composition presented was as mean percentage to moisture, Fat, Crude protein and Ash all which c...
Abstract The present study was conducted at Al Rahad Turda North Kordofan State. The main target of this study was to investigate the impact of fish introduction in Al Rahad turda on the development of the local community mainly the impact on the fisher men and fishing activity, the impact on market mediators and fish marketing and to study the impact on fish consumption .For data collection three questionnaires were designed for fishermen, market mediators and final consumers. Descriptive a...
Abstract The purpose of the study was to study the role of fisheries' marketing extention on development of nile fisheries' production and marketing for fishermen and merchants in Almorda fish market in Omdurman Locality in Khartoum State. To achieve this purpose adescriptive analytical approach was used to collect the field data. And A systemic random sampling approach was used to select a sample size of 100 Respondents (50 fishermen and 50 merchant( in Almorda Fish Market in Khartoum State...