Annual report 1989

The report describes the activities of the Institute during the year 1989, which include the following: The Zambia/Zimbabwe Lake Kariba Fisheries Research and Development Project; the pilot cage culture project; cooperative development; an economic evaluation of the Kariba International Tiger Fish Tournament; hydroacoustic surveys in Lake Kariba; and, the age structure and population dynamics of the sardine Limnothrissa miodon in Lake Kariba.

Evaluation of the contribution of fisheries and aquaculture to food security in developing countries

Fish contain important nutrients such as essential fatty acids, iron, zinc, calcium, vitamin A and vitamin C. Production of freshwater fish depends on the strategic application of various management techniques. The demand for fish products has increased beyond the natural supply, resulting in a high pressure on fisheries. Development of aquaculture is necessary for a rapid growth in fish production. A number of constraints hamper the development of aquaculture. Introduction of polyculture technologies in some countries is a way of maximizing production from different levels of the food chain. The roles of women in making fish products available to consumers is frequently over-looked by policy makers. Gender equity in policy-making and management of fisheries and in capacity building is an important issue. Fish production from inland waters and coastal areas can be increased by adopting cage and pen culture systems. Input subsidies and loans to resource poor farmers can boost fish production.

River-based artificial propagation of the African catfish Clarias gariepinus: an option for the small fish farmer

A cheap method of propagating the African catfish, Clarias gariepinus, by incubating the fertilized eggs in a cage placed directly in a flowing river is described. Hatching ranged between 39 and 70%. This is not significantly different from the commonly used water recirculating flow through system. The economic advantages of the river hatching method are discussed with special emphasis on the rural fish farmers.

Small water bodies for sustainable fisheries production

A brief account is given of some of the discussions presented at a workshop regarding reservoir fisheries in Asia held in Hangzhou, China in Oct 1990. The presentations covered the range of reservoir fisheries management options, from basic limnological research and capture fisheries to intensive cage culture. Particular reference is made to the situation in China, describing current techniques used for stocking and developing reservoir fisheries.

Disease Risks Associated with Importation of Nonindigenous Marine Animals

Transfers and introductions of marine species have occurred and are occurring on a worldwide basis, largely in response to perceived needs of expanding aquaculture industries. Greatest interest is in salmon (cage rearing and ocean ranching), shrimp, and bivalve mollusks, although other organisms are being considered. Such movements of animals carry an associated risk of moving pathogens into areas where they did not occur previously, possibly resulting in infections in native species. Many case histories of the effects of introduced pathogens and parasites now exist-enough to suggest that national and international action is necessary. Viral pathogens of shrimp and salmon, as well as protozoan parasites of mollusks and nematode parasites of eels, have entered complex "transfer networks" developed by humans, and have been transported globally with their hosts in several well-documented instances. Examining the records of transfers and introductions of marine species, incomplete as they are, permits the statement of emerging principles-foremost of which is that severe disease outbreaks can result from inadequately controlled or uncontrolled movements of marine animals.

Lune, Wyre & Furness Fisheries Advisory Committee 24th October, 1978

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 24th October, 1978. It covers information on fisheries income and expenditure, the study of salmon propagation in England and Wales, work on the future programme of fisheries work and keep nets. Also covered is a brief note on the future water supplies for South West Cumbria, water resource development, cage rearing of salmon smolts in the River Leven and the report by the area fisheries officer on usage of Middleton hatchery. The section on the report by the area fisheries officer on fishing activities includes river conditions for salmon, sea trout, non-migratory trout, Char and coarse fish, and migratory fish movements at Haverthwaite on the River Leven, Broadraine and Forge Weir on the River Lune and Duddon Hall. Stocking numbers of brown trout and rainbow trout in various rivers are also added, as well as predator numbers for various rivers, pollution incidents and fish mortalities, biological work and Skerton Weir. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 2nd July, 1979.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 2nd July 1979. The report contains sections on trial arrangements for canoeing on the River Lune at Halton during the salmon fishing season, and fishing offences and prosecutions for 1978/1979. Also included is the report by the area fisheries officer which looks at river conditions and fishing in the Rivers Lune, Furness and Wyre, the count of fish by monitoring stations, Hiddleton hatchery, cage rearing of smolts for the River Leven, stocking by the Angling Associations and Authority, fish mortalities and the removal of perch by Furness Fishing Association. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 30th June, 1980

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 30th June, 1980. It includes the report by the area fisheries officer on fisheries activities which comments on river conditions and fishing for salmon, sea trout and brown trout, and the recorded numbers of fish which passed through Duddon Hall, Haverthwaite, Halton, Broadraine and Basinghyll fish counters. Also covered in the report is an update on Middleton Hatchery which includes the numbers of salmon, sea trout and brown trout fry planted for various waters including the Lune, Keer, Duddon and Kent Catchment, and an update on the cage rearing of smolts for the River Leven. Finally the report adds fish mortalities, the pipeline project with the British Gas Corporation and the Rivers Leven and Kent fish distribution survey map. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 11th October, 1979.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 11th October 1979. The report contains the minutes of the last meeting along with the minutes of the Regional Fisheries Advisory Committee meeting held on 12th July 1979, information on pollution and fish mortalities in the River Conder, and net limitation order and fisheries byelaws for the River Lune and Wyre. It also includes the report by the area fisheries officer which looks at river conditions and fishing in the Rivers Lune, Furness and Wyre, fish monitoring at Forge Weir, Broadraine and Skerton Weir stations, and an update on Middleton Hatchery. Also covered is the cage rearing of smolts for the River Leven, stocking by the Water Authority and Angling Associations, fish mortalities and biological work carried out at Barrow Steel Works. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 10th January, 1980.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 10th January 1980. The report contains sections on the minutes of the Special Meeting held on 13th December 1979, net and fixed engine licence duties, the EEC Directive on the quality of freshwaters and terminated angling leases. It also includes the report by the area fisheries officer which looks at river conditions and fishing, fish monitoring at Broadraine, Skerton, Haverthwaite and Duddon Hall stations, and an update on Middleton hatchery. Also covered in the report is an update on the cage rearing of salmon smolts for the River Leven, stockings carried out by the Water Authority, and information on fish disease, fish spawning and net catch figures for 1979. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 10th April, 1980.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 10th April 1980. The report contains the minutes of previous meetings, information regarding rod and line licence duties, the pipeline project by British Gas Corporation, fisheries byelaws, a survey of goosanders and mergansers and information on Pedder Pots reservoir. It also includes the report by the area fisheries officer which looks at river conditions and fishing, an update on Middleton Hatchery and the cage rearing of smolts for the River Leven. It also covers stockings carried out by Angling Associations, U.D.N. fish disease and monthly salmon and sea trout catches for the 1979 season. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lake Nabigaga: a field survey undertaken by the National Fisheries Resources Research Institute (NaFIRRI)

The field survey was undertaken by NaFIRRI technical staff. The terms of reference for the survey were to make an assessment of the lake for possible cage fish farming. The survey was undertaken on the 26 August 2010 by a team composed of the several. The lake supports small subsistence fishing activities by the local communities living around it. Information from the local community indicates that the fish species/types occurring in the lake include the Ngege, Nile perch, the African catfish and the lung fish. The fishing crafts in operation are largely Dug-out and Bao Tatu canoes and the main fishing gears are nylon and monofilament gillnets, hooks and beach seines.

Challenges to effective fishing and preferred fishing gear in a hydrodynamic freshwater system

Challenges to fishing and preferred gear of multiple used Lake, whose water depth is controlled by opening of its dam gate were investigated. Geographic survey, interview and focused group discussion of fishermen were used to assess factors influencing effectiveness of fishing and the preferred gear of Asejire Lake. Water usage (s) such as frequency of Complete and Partial Opening of Dams Gate (CODG and PODG) were investigated as indices for hydrodynamic condition. Response during focused group discussion with about 33% of fishermen of the Lake were obtained on sources of disturbance to effective fishing (SDEF), most effective gear (MEG)- least environmentally perturbed gear, comparability of catch structure of preferred gear to conventional gear and sustainability of superiority of preferred gears in situations outside hydrodynamic condition (SSPPG). The PODG occurred 1-7times/Month-dry season, 15-18times/Month-wet season; CODG occurred 1-2times/Month in both season; Interval of CODG was 3-17 and 5-12days (dry and wet season). It affected set-net and catch. The SDEF were gear availability, weather condition, dam’s gate opening, religion activities and Health of fisher-folks. 50% respondents accepted opening of dams gate as most important disturbance while religion was least (5% respondents accepted). 60% respondents accepted traps as MEG being the least affected while 75% respondents accepted Gura cage trap as the MEG among traps.90% respondents accepted that among traps, its catch structure was closest (comparable) to conventional gear. However, 75% respondents rejected SSPPG. Opening of dams’ gate creates hydrodynamic condition and it affects fishing. Gura trap was preferred for fishing hydrodynamic condition.

A biochemical test for the distinction of fresh fish from frozen and thawed fish

It is observed that the freezing and thawing of fish leads to increase in the total activity of aspartate aminotransferase (AAT) in tissue fluid due to the release of the bound form of mitochondrial enzyme. Electrophoresis of the tissue fluid of fresh unfrozen fish shows only a single fast-moving band of AAT in the anodic region whereas frozen and thawed fish shows an additional slow-moving band corresponding to mitochondrial AAT in the cathodic region. The method can be adopted to distinguish fresh fish from frozen and thawed fish.

What's up on carp?

Bighead carp is preferred among other species for culture because of its fast growth and high survival rate. Pen and cage culture of carps in Laguna de Bay is sustained by the availability of juveniles as a result of improved hatchery technology. Southeast Asian Fisheries Development Center and the Bureau of Fisheries and Aquatic Resources have been conducting research programs to enhance the carp culture industry in the country.