Some biological measurements on the European sea bass in Bardawil Lagoon, Egypt | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 33, Volume 26, Issue 5, September and October 2022, Pages 571-593 PDF (1.54 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2022.264478 | ||
| Author | ||
| Heba E. Abd Elnabi et al. | ||
| Abstract | ||
| The length-weight relationship, fish growth, age composition and condition factor of the European sea bass from Bardawil Lagoon, Egypt were addressed in the current study. The exponent b of the length-weight relationship resulted in the isometric mode of growth since the value of b = 3.0287 in the power equation: W= 0.0081 L3.0287. The mean highest values of condition factor (K) of Dicentrarchus labrax were recorded in November (where K = 1.38). Scales determined age where age groups ranged from 1 to 6 years. At the end of each year, fish length was calculated as 19.0, 27.2, 34.0, 40.4, 46.4 and 50 cm for 1st, 2nd, 3rd, 4th, 5th and 6th year of life, respectively. Growth parameters (L∞), (K), (t0), and t (W∞) were estimated as L∞ = 75.6 cm, K = 0.1588 and t0 = -0.8234. Natural mortality, total mortality and fishing mortality were 0.3779, 0.8434 and 0.4655 year-1, respectively. The exploitation rate was 0.552 which indicated that the stock of the European sea bass in the study area is heavily exploited to some extent. The sex ratio of the European sea bass was determined (1M: 1.5F) during the whole period of study. The gonadosomatic index showed the greatest value during November and reached its maximum in December. At the first mature, fish length was determined as 30.0 and 29.9 cm for females and males, respectively. Absolute fecundity was increased with fish size and described by the power equation of F= 8.5123 L2.9333 (R2 = 0.9547). At the first capture, the fish length was estimated as 27.3. At the first capture, it is necessary to increase the fish length larger than the length at first sexual maturity to 30.0 cm . This can be achieved by dilating the size of the mesh used to catch D. labrax to let the females breed and recruit into the fisheries ground. This work was carried out to supplement information about exploitation rates and biological aspects of D. labrax in Bardawil Lagoon, North Sinai that could be helpful for the management of this important fish. | ||
| Keywords | ||
| Bardawil Lagoon; Dicentrarchus labrax; Length-weight relationship; Sex ratio; Fecundity | ||
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