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    Abstract
2009 (Vol. 1, Issue: 2)
Article Information:

The Age and Growth of Callinectes amicola (De Rochebrune, 1883) from Okpoka Creek, Niger Delta, Nigeria

J.F.N. Abowei, A.D.I. George and S.N. Deekae
Corresponding Author:  Abowei Jasper 

Key words:  C. amnicola, age, growth Okpoka Creek, Nigeria, , ,
Vol. 1 , (2): Page No: 73-82
Submitted Accepted Published
2009 August, 26 2009 Sept., 09
Abstract:

The Age and growth of Callinectes amicola from Okpoka Creek in the Niger Delta area of Nigeria was studied for a period of one year (January – December 2007).The size classes 30–39.9mm and 40–49.9mm constituted the highest w ith 31.0% and 31.5% respectively. Very small size class below 10mm was completely absent and largest size group (70–79.9mm) were very few (0.2%). The results of the modal length-at-age revealed that all the sexes of Callinectes belonged to the age groups 1 to 3 years. Four year classes with modal classes ranging from 6.7–68.3mm for males; 5.0–78.3mm for female and 5.8–75.8mm for combined sex. The annual carapace length increment was highest in year class 1+ and declined with time for both sexes and combined. The absolute increment was: male (17.5mm for 1–2y, 14.1 mm for 2–3y and 20.53mm annual mean); female (18.3 for 1–2y, 10.8 for 2–3y and 24.43 annual mean) and combined (18.3mm for 1–2y, 12.5mm for 2–3y and 24.43mm annual mean). Relative increment was male (47.7% for 1–2y, 26.0% for 2–3y and 36.85% annual mean); female (37.2% for 1–2y, 16.0% for 2–3y and 26.60% annual mean) and combined (40.7% for 1–2y, 19.7% for 2–3y and 30.20% annual mean). Instantaneous rate of increase was male (0.390 for 1–2y, 0.231 for 2–3y and 0.311 annual mean); female (0.316 for 1–2y, 0.148 for 2–3y and 0.232 annual mean) and combined (0.341 for 1–2y, 0.180 for 2–3y and 0.261 annual mean). Powell–Wetherall plot was L (61.80mm), K (0.995 y-1) and Z/K (1.694). The length at age data was L (61.80mm), K (2.10 y-1), to (1.220), φ (3.90) and Rn(0.122) ELEFAN 1 scans routine was L (61.80), R (2.10), φ (3.90) and Rn (0.121). The nonseasoned version of the Von Bertalanffy Growth Function (VBGF) was L (87.305mm), K (0.636 y-1), to (0.889) and φ (3.685). The longevity or maximum age (Tmax) was 4.7 years. The overall growth parameters obtained were: L = 61.80, K= 1.244y-1, to = 1.0545, Z/K = 1.694, R = 0.995, φ =3.825 and Rn =0.121.
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  Cite this Reference:
J.F.N. Abowei, A.D.I. George and S.N. Deekae, 2009. The Age and Growth of Callinectes amicola (De Rochebrune, 1883) from Okpoka Creek, Niger Delta, Nigeria.  International Journal of Animal and Veterinary Advances, 1(2): Page No: 73-82.
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