Rastineobola argentea is a dominant component of lake victorias foodweb and one of the most important commercial species in the region kayanda et al. Adults stay near the bottom during the day and near the surface at night ref. Food and feeding, condition factor, breeding periods, growth and size at first maturity of\ud a small pelagic cyprinid rastrineobola argentea p. Some aspects of the ecology and reproduction of the small pelagic cyprinid, rastrineobola argentea in lake victoria article january 2001 with 18 reads how we measure reads. The feeding habit of the cyprinidae rastrineobola argentea in its. Centropomidae with reference to its proposed role as a sportfish in australia christopher g. Pdf prospects for the fishery on the small pelagic rastrineobola. Until now, nothing was known about the biology and ecology of this fish in its new habitat whereas. Growth, mortality and mesh size selection of dagaa, rastrineobola argentea, in the winam gulf of lake victoria kenya. Fish in kenya is an important source of food, especially of high quality protein. The size at first maturity for nile perch has been declining due to stress in the population caused by heavy exploitation, changes in food availability and deteriorating. Mubamba eds, symposium on biology, stock assessment and exploitation of small pelagic fish species in the african great lakes region. This book synthesises the historical trends of the lake fisheries, the lake ecology, biology and biodiversity, socioeconomics, stock assessment, aquaculture, fish quality assurance, environmental quality and management of the fisheries resources. Reproductive biology of rastrineobola argentea pellegrin in the northern waters of lake victoria.
Rastrineobola argentea were collected from the 10 lakes described above during three field expeditions carried out during the dry season months of mayjuly in 2008, 2009, and 2010. Issue 3 jan 2000 published on 01 jan 2000 by brill. Known from the surface of inshore and coastal waters. The interactions between wild bird populations many protected by law and fish, particularly those under commercial culture or part of a fishery is subject of much controversy. Nutritional value of locally available african pig feed. Growth, mortality and recruitment of nile perch lates niloticus in lake victoria, kenya. Contemporary phenotypic change in correlated characters in. A catch effort data recording system for the fishery of the small pelagic rastrineobola argentea in the southern part of lake victoria. Some aspects of the ecology and reproduction of the small. The size at first maturity for nile perch has been declining due to stress in the population caused by heavy exploitation, changes in food availability and deteriorating water quality parameters, particularly dissolved oxygen concentration. Report on fourth fidawog workshop held at kisumu, 16 to. The evolution of fisheries in lake victoria has undergone dramatic changes over the last few decades, leading to both ecological and socioeconomic consequences.
The lake victoria sardine rastrineobola argentea, locally known as dagaa, is a very important species in supporting sustainable livelihood in the country and the region. International journal of life sciences research issn 23483148. A basis for improved pork production to improve human health 1. From there, it accidentally colonized lake ruhondo. Edwine yongo internal quality auditor university of. Fishing gear and methods used in uganda are both modern and traditional. Fish biology and life history indicators springerlink. However, it is not a legal authority for statutory or regulatory purposes. The impact of evolution and socioeconomics of commercially exploited fish stock. The lake has changed from one dominated by haplochromines in the 1950s, to one currently dominated by nile perch, dagaa rastrineobola argentea and nile tilapia.
The study has thus provided baseline information on some aspects of the biology of synodontis victoriae that are limited in the lake. Very little information on the biology and ecology of rastrineobola is available at present. The shift to smaller zooplankton in lake victoria cannot. The biomass of the endemic cyprinidae rastrineobola argentea increased. Size at first maturity, breeding periods and condition factor were determined for. Wj4ndera fisheries research institute furl, po lox 343 jinja, uganda abstract. Two species, the characid brycinus jacksonii and the cyprinid rastrineobola argentea, are still abundant in the open waters. Biology, ecology and the fishery of mukene, rastrineobola argentea.
Lake victoria located in east africa, is the largest tropical freshwater lake in the world and is currently a habitat to many. Dagaa is produced and processed in villages increasing the net income benefits to rural areas. Some isolates were negative on vogesproskauer test, could not reduce nitrate or. It contains a combination of proteins, fatty acids, vitamins and micronutrients that provide a high level nutritious diet for good.
The plank canoes are generally 4 to 12 m in length and dugout canoes average 3. To study its biology in its new habitat, samples werecollectedin. Graham 1929 and greenwood 1966 briefly summarised what was known about the fishes of lake victoria at the time and the first work specifically on rastrineobola was okedis 1973 study on its breeding biology. During the last two decades the fish population in lake victoria has changed significantly primarily due to anthropogenic activities. This study highlights the need for quantitative survey work to identify wetland refugia in the lake victoria basin and suggests that some species thought to have disappeared in the mass extinction of fishes in lakes. Hence, although having contributed to the disappearance from the lake victoria fishery of native tilapias a. Juvenile fish migrate away from the shore after spending their larval stage in shallow areas ref. Rastrineobola argentea, a small pelagic cyprinid that is endemic to the lake victoria basin in east africa.
This chapter examines the life history indicators of three commercial fish species in lake victoria, namely nile perch lates niloticus, nile tilapia oreochromis niloticus and the cyprinid known as dagaa rastrineobola argentea. Rastrineobola argentea pellegrin 1904, a small pelagic endemic cyprinid. Ecological, environmental and conservation pressures run alongside commercial pressures on exploited fish populations. Rapid morphological changes following niche shift in the zooplanktivorous cyprinid rastrineobola argentea from lake victoria published on 01 jan 2000 by brill. Rastrineobola argentea dagaa is the only endemic fish species which has remained abundant in lake. Biology, ecology and the fishery of mukene, rastrineobola. Lake victoria located in east africa, is the largest tropical freshwater lake in the world and is currently a habitat to many fish species such as the nile perch lates niloticus, nile tilapia oreochromis niloticus and silver cyprinid known locally as omena rastrineobola argentea. Reproductive biology of rastrineobola argentea pellegrin in the. Postharvest fish loss assessment on lake victoria sardine. Nutritional value of locally available african pig feed ingredients. The fishery for rastrineobola argentea in lake victoria. Acceptability of amaranth grainbased nutritious complementary foods with dagaa fish rastrineobola argentea and edible termites macrotermes subhylanus compared to corn soy blend plus among young childrenmothers dyads in western kenya. Itis taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. Rastrineobola argentea has experienced increased mortality over the past half century from two major anthropogenic sources.
As in lake victoria and lake kyoga, most of the native fish species of lake nabugabo have either been depleted or have disappeared since lates niloticus, nile perch, and oreochromis niloticus, a tilapiine, were introduced. Department of biology, boston university, 5 cummington street, boston, ma 02215. Prospects for the fishery on the small pelagic rastrineobola. It outlines the food, feeding and breeding patterns of the species. Studies on the diet of rastrineobola argentea were conducted between august 2014 and march 2015. Report of the first meeting of the working group on lake victoria rastrineobola argentea. They provide a good source of income for communities that live around lakes and contributing not only to the social and economic development of these communities but to kenyas economy. While every effort has been made to provide the most reliable and uptodate information available, ultimate legal requirements with respect to species are contained in.
The present study investigated the types and levels of. Rastrineobola argentea lake victoria light fishery beach seine spawning areas. Scholars journal of research in agriculture and biology. East african standard, the partner states shall adopt, without deviation from the approved text of the standard, the east african standard as a national standard and withdraw any existing national standard with similar scope and purpose. However, we observed that in the mwanza gulf of the lake cyclopoids dominated the zooplankton community already before the rise of. Request pdf fish biology and life history indicators life history traits like growth, reproduction, food and mortality are principal factors in the survival of the fish. The paper also examines the catch characteristics of the gears in common use by the artisanal fishermen on the ugandan waters of the lake and tries to assess the impact of these gears on the stocks of r. Rapid morphological changes following niche shift in the. This book synthesises the historical trends of the lake fisheries, the lake ecology, biology and biodiversity, socioeconomics, sk assessment, aquaculture, fish quality assurance, environmental quality and management of the fisheries resources. Part of the developments in hydrobiology book series dihy, volume 141. This exciting book draws together contributions from all over the world to provide a fascinating. Source book for the inland fishery resources of africa.
The silver cyprinid rastrineobola argentea also known as the lake victoria sardine or mukene, is a species of pelagic, freshwater rayfinned fish in the carp family, cyprinidae from east africa. Some aspects of perturbation in the structure and biodiversity of the ecosystem of lake victoria east africa. Fish biology and life history indicators request pdf. Rastrineobola argentea used for fishmeal in east africa. Bacteriocins produced by bacillus spp isolated from rastrineobola argentea omena juliana. This study aimed to investigate the composition and levels of selected. Original article life history change in response to. Life history change in response to fishing and an introduced predator in the east african cyprinid rastrineobola argentea diana m. Rastrineobola argentea now ranks second to the nile perch among fish catches from lake victoria. Rastrineobola argentea, great lakes, east africa rastrineobola argentea pellegrin 1904, a small pelagic endemic cyprinid from lake victoria was introduced into lake bulera rwanda in 1991 in order to develop a. Biological conservation 39 1987 269289 biology of the nile perch lares niloticus pisces. Life history change in response to fishing and an introduced. Usually thought of as an open water schooling fish comparative to the cyprichromis species of lake tanganyika some yssichromis found refuge from the nile perch by blending in with large schools of cyprinid rastrineobola argentea. The feeding habit of the cyprinidae rastrineobola argentea.
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