أعضاء هيئة التدريس - جامعة بنها
Age, growth and mortality of Streaked Gurnard (Trigloporus lastoviza, Bonnaterre, 1788) in the Egyptian Mediterranean waters off Alexandria
International Journal of Fisheries and Aqu atic Studies 2015; 3(1): 75-80 • 2015
معلومات البحث
المؤلفون
Sabry S El-Serafy, Fahmy I El-Gammal, Sahar F Mehanna, Nasr-Allah H
Abdel- Hameid, Elsayed FE Farrag
الكلمات المفتاحية
Not Available
المجلة العلمية
International Journal of Fisheries and Aqu atic Studies 2015; 3(1): 75-80
الناشر
Not Available
المجلد
3
العدد
1
الصفحات
75-80
publication.type
International
رابط البحث
Not Available
المواد المرفقة
Not Available
الملخص
Abstract
Age, growth and mortality of Streaked Gurnard Trigloporus lastoviza from the Egyptian Mediterranean
waters off Alexandria were investigated between the period from July 2009 and August 2010. The
observed maximum age was 4 years for both sexes based on otolith readings. The length-weight
relationship was estimated as W=0.0088L3.0694 (r=0.9854); W=0.0085L3.0836 (r=0.9803) and
W=0.0106L3.0058 (r=0.9853) for males, females and combined sexes respectively. The von Bertalanffy
growth equations for length were: Lt=27.17 (1-e-0.3466 (t+1.01), Lt = 27.0 (1 - e -0.3703 (t + 0.93) and
Lt = 26.92 (1 - e -0.3699 (t + 0.92) for males, females and combined sexes respectively. The growth
performance index value (Φ) was calculated as 2.41, 2.43 and 2.43 for males, females and combined
sexes respectively. The back calculated data indicated that the growth in length of T. lastoviza was
highest at the end of the first year of life, followed by a gradual continuous decrease throughout the fish
life. Total, natural and fishing mortalities were estimated for combined sexes as 1.51, 0.43 and 1.08 year-1
respectively. The results indicate that population is overexploited (E = 0.72) and suffering from high
fishing pressure.
Age, growth and mortality of Streaked Gurnard Trigloporus lastoviza from the Egyptian Mediterranean
waters off Alexandria were investigated between the period from July 2009 and August 2010. The
observed maximum age was 4 years for both sexes based on otolith readings. The length-weight
relationship was estimated as W=0.0088L3.0694 (r=0.9854); W=0.0085L3.0836 (r=0.9803) and
W=0.0106L3.0058 (r=0.9853) for males, females and combined sexes respectively. The von Bertalanffy
growth equations for length were: Lt=27.17 (1-e-0.3466 (t+1.01), Lt = 27.0 (1 - e -0.3703 (t + 0.93) and
Lt = 26.92 (1 - e -0.3699 (t + 0.92) for males, females and combined sexes respectively. The growth
performance index value (Φ) was calculated as 2.41, 2.43 and 2.43 for males, females and combined
sexes respectively. The back calculated data indicated that the growth in length of T. lastoviza was
highest at the end of the first year of life, followed by a gradual continuous decrease throughout the fish
life. Total, natural and fishing mortalities were estimated for combined sexes as 1.51, 0.43 and 1.08 year-1
respectively. The results indicate that population is overexploited (E = 0.72) and suffering from high
fishing pressure.