Age composition of the European hake Merluccius merluccius, Linnaeus, 1758 from the Egyptian Mediterranean waters off Alexandria

Comparison of some biological aspects between the two sexes of the European hake Merluccius merluccius from the Egyptian Mediterranean waters

“…The mean condition factor per length groups for both sexes of M. merluccius increases with length, but this increase appears most intensively for females due to the fact that females reached older ages and bigger sizes than males, this observation agrees with Abd El Aziz (1976) and Philips (2014), this may be due to differences in metabolism and oxygen consumption between sexes (Pauly, 1980). The condition factor shows higher value in winter for both males and females i.e.…”

“…The condition factor shows higher value in winter for both males and females i.e. before spawning season which starts from April to June in the Egyptian Mediterranean waters (Philips and Ragheb, 2013).…”

Age composition, growth, and mortality of European hake Merluccius merluccius (Actinopterygii: Gadiformes: Merlucciidae) from the northern Aegean Sea, Turkey

“…The asymptotic length (L ∞ ) is similar to the studies from the Gulf of Lions (Aldebert and Recasens 1996), North-east Atlantic (Godinho et al 2001), Alicante Bay (García-Rodríguez and Esteban 2002), and the Sea of Marmara (Kahraman et al 2017). However, the lower L ∞ values than those in the presently reported study were from Bay of Biscay (de Pontual et al 2006), the Moroccan North Atlantic Ocean (Belcaid and Ahmed 2011), the Egyptian Mediterranean (Philips 2014), and the Turkish coasts of the central Aegean Sea (Gurbet et al 2013, Soykan et al 2015. The value of L ∞ for males (88.54 cm) was lower than the value for females (102.34 cm), showing that the growth of the females was faster than the males.…”

“…As for k and t 0 values, the results of this study are in line with those of the other studies (Godinho et al 2001, Kahraman et al 2017. At the end, the growth performance index (Φ′) show similarities and greater from the other studies, show lower values than the study in the Egyptian Mediterranean (Philips 2014). Furthermore, according to the mentioned studies, the Φ′ value shows a significant difference (t-test; P < 0.05) (Table 5) The main factors affecting the length-weight relation are temperature, salinity, habitat, depth, maturity stages, nutrient, fishing season, sampling methodology, fishing gear selectivity, and genetic variations (Ricker 1969, Bagenal and Tesch 1978, Basilone et al 2006, Froese 2006, Domínguez-Petit et al 2010, Soykan et al 2010.…”

“…The information on the age, growth, and reproduction of the species has an important role in the management and sustainable exploitation of the stock. Several authors have studied the age estimation and growth parameters of hake , Uçkun et al 2000, Godinho et al 2001, Piñeiro and Saínza 2003, de Pontual et al 2006, Ismen et al 2010, Murua 2010, Belcaid and Ahmed 2011, Gurbet et al 2013, Costa 2013, , Khoufi et al 2014, Philips 2014, Soykan et al 2015. On the other hand, many studies on stock assessment, population dynamics, and spatial distribution of hake have been implemented by Aldebert and Recasens (1996), Orsi-Relini et al (2002), Lleonart and Maynou (2003), Stergiou et al (2003), Abella et al (2005), Gurbet et al (2013), Yalçın and Gurbet (2016).…”