Hinweis zum Urheberrecht
Bericht / Forschungsbericht / Abhandlung zugänglich unter
URL: https://epub.sub.uni-hamburg.de/epub/volltexte/2009/1845/
ANALYSIS OF THE MEDITERRANEAN (INCLUDING NORTH AFRICA) DEEP-SEA SHRIMPS FISHERY: CATCHES, EFFORT AND ECONOMICS. FINAL REPORT
Sardà, Francisco
| Originalveröffentlichung: |
| (2000) http://www.faocopemed.org/vldocs/0000191/deepseashrimps.pdf |
| pdf-Format:
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| BK - Klassifikation: |
| 48.67 |
| Sondersammelgebiete: |
| 21.3 Küsten- und Hochseefischerei |
| DDC-Sachgruppe: |
| Biowissenschaften, Biologie |
| Dokumentart: |
| Bericht / Forschungsbericht / Abhandlung |
| Sprache: |
| Englisch |
| Erstellungsjahr: |
| 2000 |
| Publikationsdatum: |
| 21.05.2009 |
| Kurzfassung auf Deutsch: |
| The project assesses the true status of basic data on catches, effort, and economic significance of the deep-water shrimps (Aristeus antennatus –rose shrimp-) and Aristaeomorpha foliacea –red shrimp-) fisheries over the entire area of exploitation. The study area encompasses the Mediterranean (coasts of Spain, and Italy) and adjacent areas of the Atlantic (Algarve, Portugal), including North Africa (Tunisia, Algeria,Morocco). It represents a first opportunity for simultaneous and comparative cooperation with the countries of North Africa. COPEMED (FAO) agreed to fund the corresponding part of the study in North Africa. A total of 31 ports around the Western and Central Mediterranean were sampled. The collected data are: catch (biomass) and
fishing effort data for the target species (Aristeus antennatus, Aristaeomorpha foliacea),the species composition and abundance (biomass) catch data for the major by-catch species, the seasonal size-frequency distributions of the target species, the location of the main fishing grounds in each subsector of the study area throughout the year, and the economic aspects of the fishery, costs and benefits. The primary purpose of the methodology employed was more to collect qualitatively accurate data than quantitative data per se, with a view to being able to put forward advisory and management strategies based on reliable information. Visits by observers to the fishing ports for purposes of sampling were conceived as a method of validating/calibrating the quality
of the data supplied by the skippers through the logbooks and also as a method of collecting first-hand information where logbooks could not be accepted by fishermen.
To that end, once or twice a week sampling was performed in the ports considered when the fishing vessels returned to port, to record the size of landings together with supplementary information from skippers on the number of hauls, towing duration,fishing locations, etc. in the period just previous to the sampling date. Results indicate that the deep-water shrimps fishing fleet consists of trawlers and multi-purpose vessels equipped with trawl nets. Catch per unit effort data on A. antennatus are most abundant for the Western Mediterranean, off mainland Spain and North Africa. High catches of
this species in these areas coincide with low catches of A. foliacea. Generally the location of rose shrimp (A. antennatus) fishing grounds varied seasonally and were located between 400 and 950 m. Spatio-temporal movements are well described in the literature and submarine canyons play and important role as fishing grounds. For each area the fishing ground locations have been described and its concrete location can be found in the data bank. The profit margin after cost coverage is quite low in most ports.
The residual amount has to be used to cover financial costs (depreciation and
opportunity cost- interests) and, above all, to remunerate the managerial factor. In fact the highest profit margins are recorded in the ports of Almeria, Mazara del Vallo and Villa Real di San Antonio, i.e. where the rose shrimp fishing fleet is managed at industrial level. All collected data are given in a GIS presentation in the attached CD and in a data bank. Along the development of this project on the Mediterranean deepsea shrimp fishery we faced a general major problem: the difficulty to collect reliable data to characterise the targeted parameters. These referred to a vast array of concepts
necessary to deal with the main features of the fishery, and ranged from the amount of catches to the power of the engines or the actual value of landings. |
