Abstract
We tried to estimate age, growth parameters, condition factor, length-weight relationship and mortality rates (Z, M, and F) of the common carp in Merdja Sidi Abed dam. Cyprinus carpio specimens were captured by long line between April and June 2013 in Merdjea Sidi abed. 220 individuals were collected and weights ranged between 265.5 and 620.3 g while the total length ranged between 26.3 and 35.6 cm. Length-converted catch curve was used to estimate total annual instantaneous mortality rates (Z), natural mortality was calculated using Pauly formula [ln(M) = -0.0152 - 0.279 ln(L∞) + 0.6543 ln(K) + 0.463 ln(T)]. Recruitment patterns were determined from the routine implemented in FISAT II. For all individuals (n = 220) of the common carp, the relationship between total length and body weight was: W = 0.0384 L2.70 (r2 = 0.906) for females and W = 0.0467 L2.653(r2 = 0.976) for males a minor allometry was found for this species, mean condition factor K was estimated at 1.41. The maximum value of recruitment was recorded in March-April period with 19.56 and 15.20 % respectively. The Battacharya method was used to estimate age of individuals that was comprised between 1 and years 3. The equation of Von Bertalanffy growth was: L = 36.75 [1-e-0.46 (t + 0.33)] for all the population. Total mortality (Z), natural mortality (M) and fishing mortality (F) were as follows: Z = 1.08, M = 0.82, F = 0.26 yr-1while exploitation ratio (E) was evaluated at 0.24 indicating an under exploitation of this local resource.
Highlights
The common carp (Cyprinus carpio L. 1758) belongs to a family Cyprinidae of order Cypriniformes is a freshwater species inhabiting warm, deep, slow-flowing and still waters such as lowland rivers and large, well vegetated lakes (Kottelat and Freyhof 2007)
Common carp Cyprinus carpio (Linnaeus 1758) specimens were captured by long line between April and June 2013 in Merdja Sidi abed dam in Wilaya of Ghelizane (36°00’12”N, 1°00’37”E)
Lengthconverted catch curve was used to estimate total annual instantaneous mortality rates (Z), natural mortality was calculated using Pauly formula [ln(M) = -0.0152 - 0.279 ln(L∞) + 0.6543 ln(K) + 0.463 ln(T)] K: growth coefficient; T: annual mean water temperature (°C); Recruitment patterns were determined from the routine implemented in FISAT II; and fishing mortality deducted from the Equation: F=Z-M. (Pauly, 1984)
Summary
The common carp (Cyprinus carpio L. 1758) belongs to a family Cyprinidae of order Cypriniformes is a freshwater species inhabiting warm, deep, slow-flowing and still waters such as lowland rivers and large, well vegetated lakes (Kottelat and Freyhof 2007). 1758) belongs to a family Cyprinidae of order Cypriniformes is a freshwater species inhabiting warm, deep, slow-flowing and still waters such as lowland rivers and large, well vegetated lakes (Kottelat and Freyhof 2007). Hardy and tolerant of a wide variety of conditions but generally favor large water bodies with slow flowing or standing water and soft bottom sediments. Thrive in large turbid rivers (Scott and Crossman 1998). Both adults and juveniles feed on a variety of benthic organisms and plant material. Common carps (Cyprinus carpio) are frequently cultured and are of great commercial value as a food fish both over their native and introduced range (Aguirre and Poss, 2000)
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