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Three fish landing centers were selected; west, middle and east of Bardawill lagoon to assess the losses of the biomass and value of the landings of juvenile Gilthead seabream (Sparus aurata) fish as one of the most important species in the fisheries of the trammel units. The study used landings of ten fishing vessels per month. Eight fishing trips were carried out each month from the end of April to the end of November 2017. The observed total length of 940 Gilthead bream, ranged from 15.2 to 29.8 cm and the weight from 47 to 385 g. The growth parameters; L∞ and K were estimated at 31.63 cm and 0.53 per year respectively. Length at first maturity (Lm50) and length at first capture (Lc50) equals 22.5 and 18 cm, respectively. Maximum biomass deficit was found in August. The study showed that there is a significant loss in the biomass and the corresponding income. The bio-economic model showed that if the juveniles of bream are allowed to grow up to length at first maturity (Lm50), the additional biomass will be about 295.2 tons per year; the corresponding annual economic gain is estimated at LE 25.22 million for each fishing season. In order to protect bream stock and to enable it to share at least for one time in reproduction, the current fishing nets should be developed to reduce the Juvenile exploitation.

BIO-ECONOMIC LOSS ASSESSMENT FOR GILTHEAD SEABREAM, IN BARDAWILL LAGOON, EGYPT