Surveys of Mesopelagic Fish Resources in the Gulf of Oman and the Gulf of Aden - July - August 1979 and January - February 1981

Table of Contents

Reports Survey with the R/V Dr Fridjof Nansen

Institute of Marine Research, Bergen University of Bergen, Department of Fisheries Biology

«Dr. Fridtjof Nansen»

The fishery research vessel «Dr. Fridtjof Nansen» belongs to the Norwegian Agency for International Development (NORAD). It was designed and built for scientific and exploratory investigations of fishery resources of developing countries, under a joint plan with the Fisheries Department of FAO based on a funding of operation to be shared and Norway.

Asgeir Aglen,^x Jakob Gjøsæter^xx, Bjørn Myrseth^xx and Snorre Tilseth^x

^xInstitute of Marine Research, Bergen

^xxUniversity of Bergen, Department of Fisheries Biology

This electronic document has been scanned using optical character recognition (OCR) software and careful manual recorrection. Even if the quality of digitalisation is high, the FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.

Table of Contents

Introduction

Material and methods

Behaviour and species composition

Gulf of Oman
Gulf of Aden
Reaction to light

Acoustical abundance estimation

Gulf of Oman
Detailed surveys in 1981
Gulf of Aden

Catch rates

Catch rates in relation to density estimates obtained by echointegration

Comparisons with previous cruises

Biological observations

Trawl experiments

Hydrographical observations

Gulf of Oman
Gulf of Aden

Technological work with Benthosema Pterotum

References

ANNEX 1. Scientific and technical staff.

ANNEX 2. Details of the acoustic equipment and settings used.

ANNEX 3. Records of fishing operations.