RELATIONSHIPS BETWEEN THE BROOD STOCKS AGE, SIZES (WEIGHT AND LENGTH) AND FIRST FISH MATURATION FOR BOTH MALES AND FEMALES OF EUROPEAN SEA BASS, Dicentrarchus labrax (L.). | ||||
| Journal of Animal and Poultry Production | ||||
| Article 4, Volume 1, Issue 11, November 2010, Page 613-626 PDF (399.73 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2010.86274 | ||||
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| Authors | ||||
| N. F. Abd El-Hakim1; M. S. Hussein1; A. A. H. Shahen2 | ||||
| 1Faculty of Agriculture, AI-Azhar University, Nasr City, Cairo, Egypt. | ||||
| 2The General Authority for Fish Resources Development , Nasr City, Cairo, Egypt. | ||||
| Abstract | ||||
| The objectives of this study aimed to evaluate the relationships between the brood stocks age, sizes (weight and length) and first fish maturation for both males and females of European sea bass Dicentrarchus labrax (L.). The present study was carried out in the Marine Fish Hatchery belonging to the General Authority for Fish Resources Development (GAFRD), Ministry of Agriculture and Land Reclamation, ARE. The hatchery located at the 21th km western of Alexandria at the road from Alexandrian to Matruh governorate. The study was performed during May 2001 to December 2004. For this experiment a total number of 300 of developed sea bass juveniles aging three months were involved. Averages of sea bass weights and lengths at the experimental start were 7.8 ± 2.6g and 4.5± 1.2cm, respectively. The present study aimed to determine the age, weight and length of sea bass(D. labraxL.)at first sexual maturity. The obtained results are summarized in the following: 1. The first mature males (13.7 % of the fish sample) were detected at 12months, while in females it was detected at 15 months of age (3.3 % of the sample). 2. Percent of mature males and females in the sample increased in almost linear manner with each advance in age to become fully mature in the sample at 36 months of age with a total weight range of 678.9 to 995.8 g for males and 853.6 to 1142.3 g for females. 3. Age appeared significant effects on body weights and lengths in both male and female sea bass where both measurements increased with each advance in age. 4. Starting with the age of 12 months, percent of mature males and females in the sample increased with each advance in age to reach 100% maturation at 36 months of age. 5. The correlation coefficients calculated between age and each of total body weight, body total length and percent of maturation were significant. The study clearly indicated that the first mature males (13.7 % the sample) were detected at 12 months of age with the average of total weight between 109.6-150g, and the average of total length between 18.4-21cm, while in females it was detected at 15 months (3.3 % of the sample) and the average of total weight was 291.2 g, and the average of total length was 33.6cm. The complete sexual maturity of female occurred at 36 months of age at body weight ranging from 678.9 to 995.8g and, which the total length was 38.2 to 60.6.4cm, in males at the same age and average body weights ranging from 853.6to 1142.3 g with the total length was 43.2 to 68.5cm. The sea bass male and female fish reached 100% maturation with a sex ratio to 1:1.1 for female and male, respectively. | ||||
| Keywords | ||||
| Brood stocks age; sizes; first fish maturation; European sea bass; Dicentrarchus labrax (L.) | ||||
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