Aluminium in Fisch und Fischereierzeugnissen

Recent reports associating aluminium with several skeletal (osteomalacia) and neurological disorders (encephalopathy and Alzheimer’s disease) in humans suggest that exposure to aluminium may pose a hazard to health. This requires the examination of aluminiumcontent in different foodstuffs. Therefore, an analytical method for the determination of aluminium in fish and fishery products, especially in fishery products packaged in aluminium cans, was developed using graphite furnace atomic absorption spectrometry. Fillets of lean and fatty fish showed aluminium levels lower than 1mg/kg wet weight, muscle of crustacean, molluscan and shellfish had apparently higher aluminium levels (up to 20 mg/kg wet weight). The aluminium content in some aluminum-canned herring was much higher than the content found in herring caught in the North Sea. These results indicate that aluminium is taken up by the herring fillets in aluminium cans, presumably through the slight and slow dissolution of aluminium from the can wall, due to some defects in the protective lacquer layer. A comparison of the aluminium levels measured in canned herring with the average aluminium-intake (normally between 3 and 5 mg/day) or with the provisional tolerable daily intake of 1mg/kg body weight per day (WHO 1989) indicated, that the aluminium content of the edible part of aquatic food does not play a significant role. High consumption of fish fillets does not pose any health risk.

Norwegens Fischerei 1996: Anlandungen und Erlöse weiter gestiegen

Norway’s sea fishery 1996 ranked 9th world wide. Preliminary data for 1996, as published in the Norwegean journal Fiskets Gang, show a further increase of the total catch by 114 000 tonnes, which now reached 2.63 million tonnes. The value of these landings were 8550 million nkr, up by 381 million nkr. The 5 most caught species were herring, cod, blue whiting and saithe. The 5 highest values, however, were obtained by cod, mackerel, herring, saithe and deepsea prawn. Considerable increases of prices were noted for jack mackerel (+142 %), mackerel (+133 %) and herring (+34 %).

Post harvest losses in the fisheries of Kainji Lake

An assessment is given of the post-harvest losses in the Lake Kainji fisheries of Nigeria. The study focussed on quantifiable information on post-harvest technology and post-harvest losses from fisherfolk, fish processors and fish traders operating within the Kainji Lake basin. The information was obtained from questionnaires sent to a total of 665 respondents, comprising 317 fishermen, 115 fish processors, 125 fish buyers, and 111 fish sellers in 45 fishing villages and collection centres within the lake basin. Considering the total catch from gillnets, longlines, traps and cast nets estimated at 14,000 in 1995 about 1,000 t of fish was either discarded or lost value due to spoilage during handling by fisherfolk. Assuming an average prices of 80 Naira/kg of fish, the loss to the economy amounted to 80 million Naira annually. Appropriate recommendations are made to significantly reduce post-harvest losses in the Kainji Lake fishery. (PDF contains 91 pages)

Fisheries statistical bulletin, Kainji Lake, northern Nigeria, 1997

The bulletin presents summary tables and charts on levels of fishing activity, fishing effort, yields and economic values of yields for the fisheries of Kainji Lake, Nigeria for the year 1997. Frame survey data and fishing gear measurements are also included. (PDF contains 34 pages)

Fisheries statistics of Kainji Lake, northern Nigeria, Nov. 1994 - Dec. 1998

Results are presented for the first 4 years data (1994-1998) of the Kainji Lake catch assessment survey, collected and analysed by the Nigerian-German Kainji Lake Fisheries Promotion Project. The following areas are covered: Methodology and alterations of the original sampling concept; Frame survey results - factors relating to the CAS; Catch assessment survey results - general; Gill net fishery; Drift net fishery; Beach seine fishery; Cast net fishery; Longline fishery; Trap fishery; and, Catch statistics from fisherwomen. (PDF contains 143 pages)

Fisheries statistical bulletin, Kainji Lake, Nigeria, 1998

A tabulated summary is presented of the main fisheries data collected to date (1998) by the Nigerian-German Kainji Lake Fisheries Promotion Project, together with a current overview of the fishery. The data are given under the following sections: 1) Fishing localities and types; 2) Frame survey data; 3) Number of licensed fishermen by state; 4) Mesh size distribution; 5) Fishing net characteristics; 6) Fish yield; 7) Total annual fishing effort by gear type; 8) Total annual value of fish landed by gear type; 9) Graphs of effort and CPUE by gear type. (PDF contains 36 pages)

Fisheries statistical bulletin, Kainji Lake, Nigeria, 1999

A tabulated summary is presented of the main Lake Kainji fisheries data collected to date (1999) by the Nigerian-German Kainji Lake Fisheries Promotion Project, together with a current overview of the fishery. The data are given under the following sections: 1) Fishing localities and types; 2) Frame survey data; 3) Number of licensed fishermen by state; 4) Mesh size distribution; 5) Fishing net characteristics; 6) Fish yield; 7) Average monthly CPUE by gear type; 8)Average monthly fishing activity by gear type; 9) Total annual fishing effort by gear type; 10) Total annual value of fish landed by gear type; 11) Trends of the total yield by gear type. (PDF contains 34 pages)

Environmental hazards to small scale fisheries resources management in Nigeria

This paper examined the environmental hazards limiting sustainable small-scale fisheries development in Nigeria. Observation has showed that hazards range from pollution of the aquatic habitats by domestic and urban sewage and garbage, agro-chemicals, industrial pollutants, crude oil spillage etc. In an attempt to maximize catch, many migrant and part-time fisher folks indulge in highly destructive and obnoxious fishing practices with adverse impact on fisheries resources. These have constituted significant environmental hazards. Discharges of waste from aquacultural practices in to rivers and lakes have also been identified as sources of environmental hazards. Some aquatic weeds such as water hyacinth are sources of hazards. The effects of environmental hazards on small-scale fisheries resources may be direct arising from the toxicity of pollutants or indirect as a result of ecosystem modification. Some of the effects of pollutants on the aquatic environment and fish have been discussed in the paper

Nigerian German Kainji Lake Fisheries Promotion Project - approach, result, future

The paper highlighted the overall goal and purpose of the Nigerian German Kainji Lake Fisheries Promotion Project. The main goal is to increase the standard of living of fishing communities in the project area. The target groups are the fishermen and fisherwomen in the area. The project also developed in effective extension delivery system in the basin. Also developed at the project headquarters are facilities for the execution of the project. The project are able to carry out frame, gear and stock assessment surveys on the Lake and able to formulate a fisheries management plan for the fisheries of Kainji Lake

Assessing societal vulnerability of U.S. Pacific Northwest communities to storm induced coastal change

Progressive increases in storm intensities and extreme wave heights have been documented along the U.S. West Coast. Paired with global sea level rise and the potential for an increase in El Niño occurrences, these trends have substantial implications for the vulnerability of coastal communities to natural coastal hazards. Community vulnerability to hazards is characterized by the exposure, sensitivity, and adaptive capacity of human-environmental systems that influence potential impacts. To demonstrate how societal vulnerability to coastal hazards varies with both physical and social factors, we compared community exposure and sensitivity to storm-induced coastal change scenarios in Tillamook (Oregon) and Pacific (Washington) Counties. While both are backed by low-lying coastal dunes, communities in these two counties have experienced different shoreline change histories and have chosen to use the adjacent land in different ways. Therefore, community vulnerability varies significantly between the two counties. Identifying the reasons for this variability can help land-use managers make decisions to increase community resilience and reduce vulnerability in spite of a changing climate. (PDF contains 4 pages)

Species Profiles: Life Histories and Environmental Requirements of Coastal Fishes and Invertebrates (Pacific Northwest): Amphipods

This report wi11 focus largely on the suborders Gammaridea, Caprellidea, and Hyperiidea because of their importance in coastal areas of the northeast Pacific Ocean. (PDF contains 27 pages)

Species Profiles: Life Histories and Environmental Requirements of Coastal Fishes and Invertebrates (Pacific Southwest): Amphipods

(PDF contains 24 pages)

Report of the Inter-American Tropical Tuna Commission for the year 1952

ENGLISH: The Inter-American Tropical Tuna Commission, established by a Convention between the United States and Costa Rica, has as its purpose the collection and interpretation of information which will facilitate maintaining, at levels of maximum sustained yield, the populations of tropical tunas in the Eastern Pacific and of the bait species used in their capture. To this end, the Commission is directed by the Convention to undertake investigations of the tunas and bait species, and to make recommendations for joint action by the member governments designed to attain the objectives of the Convention. The year 1952 is the second since the initiation of the investigations of the Commission. The Commission was organized in 1950. Its program of investigations ~as outlined and work commenced during 1951. The work during 1952 has been a continuation and logical development of the research commenced the previous year. SPANISH: La Comisión Interamericana del Atún Tropical, establecida por una Convención entra Costa Rica y los Estados Unidos de América, tiene como deberes recolectar e interpretar la información que facilite el mantenimiento, a niveles de una contínua producción máxima, de las poblaciones de las especies tropicales de atún en el Pacífico Oriental y de los peces de carnada que se emplean para su pesca. Con este propósito la Comisión se encarga, en conformidad con los términos de la antes expresada Convención de efectuar investigaciones sobre los atunes y mencionadas especies de carnada, y de hacer recomendaciones a los Gobiernos Miembros a fin de que pueden tomar una acción conjunta que les permita obtener los resultados que el citado Convenio persigue. El año 1952 es el segundo desde la iniciación de las investigaciones de la Comisión. Esta fué organizada en 1950. Durante 1951 se preparó el programa de estudios y se comenzaron los trabajos. La tarea realizada en el año 1952 ha sido una continuación y lógico desarrollo de las investigaciones empezadas en el año anterior. (PDF contains 61 pages.)

Report of the Inter-American Tropical Tuna Commission for the year 1953

ENGLISH: The Inter-American Tropical Tuna Commission was established in 1950 by a Convention between Costa Rica and the United States. The Convention provides for the subsequent adherence of other nations interested in the tuna fishery of the tropical Eastern Pacific Ocean. Panama adhered to the Convention in September 1953. The Commission has the duties of collecting and interpreting all necessary factual information respecting the tunas and tuna-bait fishes in order to facilitate maintaining the populations thereof at levels permitting maximum sustained yields, and of making recommendations to the member governments for joint action toward this objective. The Commission commenced its investigations in 1951. The year 1953 is the third year of scientific study. During the year investigations along several lines were continued and further developed. SPANISH: La Comisión Interamericano del Atún Tropical fué establecida en 1950 en virtud de una Convención entre Costa Rica y los Estados Unidos. La Convención abre la puerta para que otras naciones interesadas en las pesquerías de atún en aguas tropicales del Pacífico Oriental, puedan adherirse posteriormente. Panamá se adhirió al Tratado en Septiembre de 1953. La Comisión tiene como deberes recolectar e interpretar todos los informes necesarios respecto de las especies de atún y de los peces de carnada que sirven para pescarlas¡ a fin de facilitar el mantenimiento de las respectivas poblaciones a niveles que permitan un rendimiento máximo permanente; y hacer recomendaciones a los gobiernos miembros para que actúen conjuntamente en pro de los indicados objetivos. Nuestro organismo comenzó sus investigaciones en 1951. El año 1953 es el tercero de estudios científicos. Durante dicho año se continuaron investigaciones en diversas líneas y se prosiguió su desarrollo. (PDF contains 87 pages.)

Report of the Inter-American Tropical Tuna Commission for the year 1955

ENGLISH: This is the fifth year of investigations, by the Inter-American Tropical Tuna Commission, of the fisheries for tunas and tuna-bait fishes in the Eastern Pacific Ocean adjacent to the shores of the Americas. These investigations are being conducted by an international scientific staff, under the provisions of a Convention to which Costa Rica, Panama, and the United States are signatories. Other nations having an interest in these fisheries may adhere through exchange of correspondence with the present member governments. SPANISH: Este es el quinto año de investigaciones efectuadas por la Comisión Interamericana del Atún Tropical sobre las pesquerías de atún y de peces de carnada usados para la captura de éste, en la zona del Pacífico Oriental adyacente a las costas de las Américas. Estas investigaciones están a cargo de un grupo internacional de científicos, de acuerdo 'con la Convención de la que son signatarias Costa Rica, Panamá y los Estados Unidos. Cualquier nación que tenga interés en estas pesquerías, puede adherirse a la Convención mediante un cambio de correspondencia con los Gobiernos Miembros. (PDF contains 95 pages.)