The Morphology, Abundance, Condition Factor and Length-weight Relationship of Ethmalosa fimbriata (Bowdish 1825) from Nkoro River Niger Delta, Nigeria

J. F. N. Abowei

《Advance Journal of Food Science and Technology》 1卷1期 (2009/12) Pp. 51-56

並列摘要

The morphology, abundance, condition factor and length-w eight relationship of Ethmalosa fimbriata from Nkoro River in the Niger Delta area of Nigeria was studied from January-December 2008. The body description of E. fimbriata from Nkoro River was; Dorsal spine (total): 0, Dorsal soft rays(total): 16-19, Anal spine: 0, Anal soft rays: 19-23. The m outh is sharply upw ard and V-shaped. Caudal fin is deep chrome with long and pointed tips. The upper jaw contains distinct median notch, into which tip of lower jaw fits. Lower gill rakes are long, fine and numerous, often 3 times as long as gill filaments; upper gill rakes bent. There is a faint dark spot behind gill cover sometimes followed by others. The dorsal fin tip is black with golden tints on the body. The scute is 16-19, pre-pelvic, 10-13 post and scales in lateral series is 37-42. The highest catch was recorded in January (8.16), followed by February (4.21), May (1.65), March (1.40), April (1.11) and October (1.10). June (0.87), December (0.32), November (0.20) and July (0.14) were less than 1. No catch was recorded for August and September during the study. T he highest catch per unit effort (5.62) w as recorded in station 2, followed by station 1 (5.04) and station 4. The least catch per unit effort (3.75) was recorded in station 3. From a sample size of 1200 specimens, K value was 0.946 and the exponential equation was Wt=0.162 (TL)^(3.199), indicating an isometric growth pattern. The highest condition factor value (1.00) was recorded in May and the lowest (0.6) in September. This was an indication that the beginning of rains favors E. fimbriata than mid rains.

並列關鍵字

Ethmalosa fimbriata ； morphology ； abundance ； condition factor ； length-weight relationship ； Nkoro River ； Nigeria