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No Thumbnail AvailableProjectStatus Report No. 1 - Survey Results of Dr. Fridtjof Nansen, 1975
Indian Ocean Fishery and Development programme Pelagic Fish assessment Survey North Arabian Sea
1975Also available in:
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DocumentSummary report on cruise of the R/V Shoyo Maru in the North Arabian Sea, 2 October 1975 - 14 January 1976 1976
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No results found.As reported in the Fourth Session of the IOFC Executive Committee held in Rome in October 1974, the efforts of IOP in bringing the R/V Shoyo Maru to participate in the North Arabian Sea survey succeeded when the vessel undertook cruises along the waters of Pakistan in November/December 1975. The present paper gives a brief description of the survey and its results, summarized from the original report in Japanese which has been published by the Fishery Agency of Japan in July 1976. The activities covered oceanographic observation, conventional biological survey (sighting of pelagic shoals and collection of fishes) and acoustic survey. A rendez-vous with the R/V Dr. F. Nansen, the main vessel for the North Arabian Sea survey, for calibration of acoustic instruments was a special feature of the survey. The up-welling supposedly to be remnant of the southwest monsoon phenomenon was located at 23°N, 63°E as late as November during the year of survey. Another up-welling noticed in the vicini ty of 24°N, 66°E was interpreted as one inherent to the continental slope. The pelagic shoals appeared rather scarce in the offshore waters covered by the vessel and the demersal fishes were located mainly in the continental slope. The demersal catch included longspine seabream, giant catfish, Jarboua therapon, threadfin breams, brushtooth lizardfish and sweetlips. Indications of substantial stock of squids were noticed in the offshore waters around the up-welling area. The squids appear to sink to deeper layers of 100-350 mt during daytime and move to the upper layer at night and are easily hooked by jigs. -
No Thumbnail AvailableProjectThe Pelagic and Demersal Fish Resources of North East Somalia - Results of two surveys with R/V Dr. Fridtjof Nansen in 1984. Final Report 1984
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No results found.Since the International Indian Ocean Expedition (IIOE, 1959-65), which produced abundant data on the oceanographic and biological environment, the seas off North East Somalia have been known to belong to the high productive areas of the world in terms of primary and secondary production, due to the seasonal upwelling occurring in the area. Even though direct data on fish resources were missing, it was assumed that the area could hold considerable fish resources. Based on the findings f rom IIOE, a joint programme between the Norwegian Agency for International Development (NORAD) and the Food and Agriculture Organisation of the United Nations (FAO) was set up to investigate the fish resources of the Arabian Sea. In the period from January 1975 to November 1976 the R/V “Dr. Fridtjof Nansen” carried out five coverages of the coastal waters from Pakistan to Somalia. Based on the acoustic data collected during these surveys, the fish resources of Somalia were estimated to the avera ge level of 570 thousand tonnes for the small pelagic fish and 400 thousand tonnes for demersal fish, making it one of the most productive areas in the Indian Ocean. The dominating part of the pelagic stock was located between Ras Hafun and Ras Asir, which is also the center of the upwelling system. During the years 1983-84 the vessel returned to the region under the UNDP/FAO programme GLO/82/001 “Survey and identification of World Marine Resources”, with the purpose of investigating the hi gh productive regions located during the 1975-76 surveys. In agreement with the Ministry of Fisheries in Mogadishu two coverages of the region between Ras Asir and Ras Mabber were planned for February and August 1984. The main objectives of these surveys were to update the previous findings and provide more detailed information on the state of the resources with a more intensive sampling programme than during the earlier surveys.
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