Effects of shrimp trawlers on the fisheries status and environment of the Northwest Arabian Gulf

• Autorzy: Ali T S
• Języki publikacji: EN

Abstrakty

EN

The catch per unit effort (c.p.u.e.) estimated as kg/hr and the yield per recruitment (Y/R) often common by-catch fishes are used in the present paper to investigate the effects of shrimp trawlers on the fisheries status and its environment in the Northwest Arabian Gulf. Samples were collected on weekly basis through fishery-oceanography survey carried out by the Marine Science Centre at the University of Basrah during the period of 1995-1999, using two small shrimp trawlers. The catch per unit effort (c.p.u.e.) of total, commercial fishes, shrimps, and other invertebrates catches showed a drastic drop year by year. The results of the relative yield per recruitment (Y′/R) of the ten investigated species, their optimum and current lengths at first capture (Lc) and their lengths at first maturation (Lm) indicate that the stock of these species suffered a problem of recruitment overfishing. A strategy of protection for Northwest Arabian Gulf fisheries involves implementing closed season, introducing an effort limitation policy should be designed.

PL

Połowy na jednostkę łowczą (c.p.u.e.) wyrażone w kg/h oraz względna uzyskana wydajność - „odłów na rekruta" (Y/R) dziesięciu gatunków ryb powszechnie występujących w przyłowie zostały wykorzystane w niniejszej pracy do zbadania wpływu trawlerów krewetkowych na stan rybołówstwa i środowiska naturalnego w północnej części Zatoki Perskiej. Próby z wykorzystaniem dwóch małych trawlerów krewetkowych pobierano co tydzień w ramach rybacko-oceanograficznego programu badawczego prowadzonego przez Centrum Badań Morza Uniwersytetu w Basrah w latach 1995-1999. Wydajność jednostek (c.p.u.e.) dla wszystkich ryb poławianych przemysłowo, krewetek i innych bezkręgowców z roku na rok wykazywała drastyczny spadek. Wyniki wydajności względnej (Y/R) dziesięciu badanych gatunków, ich optymalnej i rzeczywistej długości w czasie pierwszego połowu (Lc) oraz ich długości w czasie pierwszej dojrzałości (Lm) wskazują, że w stadach tych gatunków nastąpiło przełowienie. Strategia ochrony północnozachodniej Zatoki Perskiej zakłada wprowadzenie zamkniętego sezonu połowowego, który zapoczątkuje opracowanie polityki ochronnej.

Słowa kluczowe

EN

Arabian Gulf; environment; shrimp trawler; catch; fishery

• Wydawca: -
• Czasopismo: Acta Ichthyologica et Piscatoria
• Rocznik: 2001
• Tom: 31
• Numer: 2
• Opis fizyczny: p.77-86,fig.,ref.

Twórcy

autor

Ali T S

• University of Basrah, Basrah, Iraq

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