Thumbnail Image

Field surveys and the survey and charting of resources

Year of publication 1971

Pages VIII, 22

Author Alverson, D.L.

Publisher FAO ;

Product type Document

Edition 1

Synopsis (short abstract) Considerable exploratory fishing has been conducted in the Indian Ocean, particularly directed towards definition of demersal fish stocks of the Continental Shelf. Sporadic activities have been undertaken to investigate pelagic tuna and associated species. Shelf species are relatively well-known. Bottom fish populations at depths of 200 mt and more are not generally well-known, and shelf areas off East Africa and Australia need more investigation. The abundance of coastal pelagic species require s definition, as does the distribution. Mangrove swamps and coral seas should be considered special ecological zones. Five major projects should be considered: coastal pelagic fish investigations, collection of bottom fish investigations, detailed studies of selected coral seas and mangrove swamp areas, and studies of some pelagic nekton. Investigators on FAO/UNDP Projects should receive specific instructions regarding the data they collect; this information should be deposited at a Regional Dat a Centre and at FAO Headquarters. Field surveys should, when possible, be contracted to national laboratories or to universities or qualified private research groups. Surveys should be regional in character.

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • Thumbnail Image
    Document
    Survey of resources in the Indian Ocean and Indonesian area 1971
    Also available in:
    No results found.
    The resources of the tropical ocean derive from a number of separate ecosystems; for the present purpose there are five: the upwelling areas, offshore oceanic areas, coral seas, mangrove swamps, and coastal areas outside upwelling regions; Studies of the oceanic system lead to the conclusion that stocks of the four most valued tunas (yellowfin, bigeye, albacore, and southern bluefin) are fully exploited; other tunas and tuna-like fishes perhaps can be exploited: Spanish mackerel and especially s kipjack, whose estimated production is 100.000 tons; Coral seas are difficult to exploit, but production is likely to be high; there may be tertiary resources of Sardinella or mackerels over the whole coral area; Mangrove swamps are extensive, and their high productivity could be exploited with a variety of fish, shellfish, and crustacean cultures; the swamps need to be investigated for present resources; Upwelling areas and the associated offshore divergences are the most productive; the most p romising area for development is that off Northern Somalia and Southern Arabia, followed by the Malabar Coast and the Indonesian area. A fisheries survey should be mounted to catalogue resources of the three promising areas; surveys of pelagic resources with echo-sounders and purse-seines should be initiated all over the region but particularly in the upwelling areas.
  • Thumbnail Image
    Book (series)
    The Dr. Fridtjof Nansen Programme 1975–1993: Investigations of Fishery Resources in Developing Regions
    FAO Fisheries Technical Paper 391
    1999
    Also available in:
    No results found.
    This document provides a review of practically all the surveys carried out with the research vessel “Dr. Fridtjof Nansen” from 1975 to the middle of 1993 in the Indian, Atlantic and Pacific Oceans. Complete lists of all surveys carried out by this R/V, and reports produced and of scientific staff participating in the surveys are provided as annexes. Chapter 2 provides an overview of survey methodology and also describes the development in the acoustic equipment used and associated problems. Particular emphasis is placed on the surveys carried out in the Arabian Sea, supplemented by a review of surveys carried out by the sister ship “Rastrelliger” off Southwest India. The results of the first surveys of the “Dr. Fridtjof Nansen” are revised on the basis of the latest knowledge of acoustic equipment and properties and consequently many results of the earlier surveys have been sized down. Other areas covered are: the Bay of Bengal off Bangladesh and Myanmar, sea areas around peni nsular Malaysia and areas off western Thailand and Indonesia; the Southwest Indian Ocean; the Atlantic Ocean off Northwest Africa, Southwest Africa, with special emphasis on surveys off Angola and Namibia and the shelf area between Suriname and Venezuela; shelf areas in the Pacific Ocean between Southern Mexico and Colombia. The R/V Dr. Fridtjof Nansen has provided some of the best groundtruthing of the rough estimates of the potential resources first published by FAO in 1970. In Chapter 10 t he survey results are compared with those early guesses and estimates based on acoustic and trawl surveys of the productivity per unit area of small pelagic and demersal fish are provided. The results of the surveys have also been used for analyses of demersal fish assemblages, reviewed in the various chapters by area and in Chapter 10 and for the production of a number of FAO Fish Identification Sheets and Field Guides, of which the references are given in Chapter 11.
  • Thumbnail Image
    Book (series)
    The living marine resources of the Western Central Pacific. Volume 1. Seaweeds, corals, bivalves and gastropods 1998
    Also available in:
    No results found.
    This multivolume field guide covers the species of interest to fisheries of the major marine resource groups exploited in the Western Central Pacific. The area of coverage includes FAO Fishing Area 71 and the southwestern portion of Fishing Area 77 corresponding to the South Pacific Commission mandate area. The marine resource groups included are seaweeds, corals, bivalves, gastropods, cephalopods, stomatopods, shrimps, lobsters, crabs, holothurians, sharks, batoid fishes, chimaeras, bony fishes , estuarine crocodiles, sea turtles, sea snakes, and marine mammals.
Show more

Users also downloaded

Showing related downloaded files

No results found.