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Bottom trawl surveys design, operation and analysis











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    Report of the Workshop to plan the 1999 R/V DR. FRIDTJOF NANSEN surveys in the northern CECAF area and the standardization of acoustic surveys in the region. Casablanca, Morocco, 18-22 October 1999. / Rapport de l'Atelier pour la planification des prospections du N/R DR. FRIDTJOF NANSEN dans la zone nord du COPACE en 1999 et la standardisation des campagnes acoustiques de la région. Casablanca, Maroc, 18-22 octobre 1999. 2001
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    A Workshop to plan the 1999 R/V DR. FRIDTJOF NANSEN surveys in the northern CECAF area and the standardization of acoustic surveys in the region was held in Casablanca, Morocco from 18 to 22 October 1999. This Workshop was a follow-up to the Workshop "A review of the surveys off Northwest Africa in the 1990s" held in Bergen in 1998 (FAO, 1998). The countries represented were the Gambia, Mauritania, Morocco and Senegal as well as Norway, Russia and FAO. The purpose of the Workshop was to plan the 1999 acoustic survey with the R/V DR. FRIDTJOF NANSEN off Northwest Africa in November-December 1999 and to discuss the standardization of acoustic surveys in the Northern CECAF area as well as following-up on other recommendations from the meeting in Bergen in 1998. The Workshop stressed the usefulness of the results from the DR. FRIDTJOF NANSEN surveys and strongly recommended that the surveys be continued. The Workshop considered that the use of the results for stock assessment could st ill be increased at a regional level and therefore recommended to establish a Working Group on assessment of small pelagic resources in the same region as covered by the DR. FRIDTJOF NANSEN surveys. The Working Group on Guidelines provided a first draft of the Guidelines for acoustic surveys in Northwest Africa. It was recommended that the Working Group should meet again before the next acoustic survey in the year 2000.
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    The Guinea 90 survey 1991
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    This report presents the results of the “GUINEA 90” survey conducted in the Eastern Central Atlantic during April 1990 aboard the Spanish commercial fishing vessel LAGOAPESCA. The objective of the survey was to investigate the demersal fishery resources off the coasts of Sierra Leone, Liberia, Côte d'Ivoire and Ghana within the 20–700 m depth limits, using fishing gear with 45 mm mesh in the codend. Catch percentages of the different demersal communities (Longhurst, 1969) together with fishing yields of all species by stratum and country are reported. Overall, the most abundant catches correspond to Côte d'Ivoire, and down to 200 m depth the Sparidae predominate. The commercial species offering highest yields were Dentex angolensis and Pagellus bellottii bellottii, with notable quantities of D. congoensis and Brachydeuterus auritus.
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    Report on the R/V Dr. Fridtjof Nansen - Fish Resource Surveys of West Africa: Morocco to Ghana, and Cape Verde 1982
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    The Norwegian research vessel Dr. Fridtjof Nansen has, under a joint NORAD/UNDP/FAO programme (GLO/79/011), carried out acoustic surveys off West Africa in the period May 1981 to May 1982. The work included in this report comprises three surveys of the shelf from Cape Blanc to Cape Verga with two of these extended down to Sherbro Island, two coverages of the shelf off the western Sahara and single coverages in Morocco north to Agadir and in the region Liberia-Ghana. A sin gle survey in the Republic of Cape Verde is also included in the report as a separate part.

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