Figure 5 - uploaded by Sedat Gündoğdu
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Relationships between von Bertalanffy growth parameters ( a-L ∞ vs L max , b-ln(K) vs t max , c-ln(K) vs t 0 ) and the fitted curves belonging to those. The middle curve in each graph represents the fitted curve, and the other two represent the 95% confidence limits.
Source publication
Estimation of the growth parameters of fish are vital to understand their biology. For this purpose
we collected studies that performed up to 2017 regarding the growth of species belonging to the
Diplodus genus. Data were gathered from sources like Web of Science (webofknowledge.com),
Scopus (scopus.com), Google Scholar (scholar.google.com), Resear...
Contexts in source publication
Context 1
... was deter- mined that the relationship between t max and K is negative and statistically significant (r=-0.41, P<0.05, í µí°¿í µí±(í µí°¾) = −0.72 − 0.38 * í µí°¿í µí±(í µí±¡ í µí±í µí±í µí±¥ ); Figure 5). It was also deter- mined that the relationship between K and L ∞ is negative and statistically significant (r=-0.71, ...
Context 2
... was also deter- mined that the relationship between K and L ∞ is negative and statistically significant (r=-0.71, P<0.05, í µí°¿í µí±(í µí°¾) = 1.66 − 0.92 * í µí°¿í µí±(í µí°¿ ∞ ); Figure 5). ...
Context 3
... is known that there's a negative relationship be- tween these two parameters (Beverton and Holt, 1959;Adams, 1980;Pauly, 1980;Munro and Pauly, 1983;Pauly and Munro, 1984;Wootton, 2012). The negative correlation (- 0.71) found in this study matches this general assumption ( Figure 5). However, despite the presence of this negative relationship, in reality there's no direct evidence in natural populations regarding this negative correlation ( Pilling et al., 2002;Helser and Lai, 2004). ...
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Citations
This study was conducted to estimate some biological aspects and fisheries assessment of Diplodus vul-garis caught by gillnets during the period 2018-2020 from the Egyptian Mediterranean waters of Alexandria. From an overall of 1004 individuals of D. vulgaris (10.0-24.0 cm TL) examined, lengths from 13.0 to 17.0 cm were representing 82.67% of the total fish number. The length-weight relationships for total and gutted weights of the D. vulgaris were: Log W = À1.7144 + 2.9063 Log L (R 2 = 0.9982) and Log W = À1.8508 + 2.9903 Log L (R 2 = 0.9967), respectively. The condition factor (k) was found to be fluctuating between 1.268 and 1.534 with an average value of 1.395 ± 0.0597. The overall sex ratio (M: F) was 1.00: 0.63 and the chi-square test revealed highly significant difference (v 2 = 24.80; df = 1; P < 0.01). The spawning season of D. vulgaris was observed from December to February for both sexes. The gonadoso-matic index (GSI) reached its highest value in December for both sexes. The age composition of the D. vulgaris catch was estimated to be four years and the first age dominated the population. The present von Bertalanffy growth parameters were calculated as follows: the coefficient of growth (K) = 0.128 yr.-1 , the asymptotic length (L 1) = 37.06 cm, and the hypothetical age at zero size (t o) = À2.773 yr.-1. The growth performance index (U') was: U' L = 2.24, and U' W = 1.00. The reproductive load (L m /L 1) was low for males (0.39) and females (0.37). The ratio L max D / L m D was 1.36 and 1.39 for males and females, respectively and it was found to be compatible with the Pauly's Gill-Oxygen Limitation Theory (GOLT). The total mortality coefficient (Z) was 1.79, the natural mortality (M) was 0.39 and fishing mortality (F) was 1.40. The M/K was 3.0615 and Lc/L 1 was 0.371. At the level of the current exploitation rate (E cur = 0.78), the stock is considered highly exploited by gillnets fishery and only 9.34% of the stock biomass is protected. Fishery management for this wild stock is highly required.
