Fisheries management of cichlid fishes in Nozha Hydrodrome, Alexandria, Egypt

Length-Weight Relationship and Condition Factor of Some Fishes from the River Nile in Egypt with Special Reference to Four Tilapia Species

“…In addition, the mean condition factor of Atherina boyeri in Lake Iznik, Turky, ranged from 0.41 to 0.80 (Ozeren, 2009), and from 0.49 to 0.60 in Hirfanli Reservoir in Turkey (Gencoglu and Ekmekçi, 2016). Many studies had been conducted to the length-weight relationship and condition factor of tilapia species in the Egyptian waters; in the River Nile (Tharwat, 1995;El-Kasheif, 2003;Mazrouh, 2008, Authman et al, 2009;Hassan & El-Kasheif, 2013;El-Bokhty & El-Far, 2014), in Lake Manzala ( Bayoumi & Khalil, 1988;Soliman et al, 1998;Shalloof, 1991;Bakhoum and Abdallah, 2002;El-Bokhty, 2006 andFarouk, 2009 ), in Lake Nasser (Latif & Khallaf, 1987;Agaypi, 1992;Mekkawy et al, 1994;Shenouda et al, 1995 andKhalifa et al, 2000 ), in Abu-Zabal Lakes (Ibrahim et al, 2008 andEl-Far, 2009), in Lake Qarun (Shalloof, 2009), in Wadi El-Rayan depressions (El-Gammal and Mehanna, 2003;Mehanna, 2004 andMehanna, 2005) in Lake Temsah (Mahomoud et al, 2011), in Nozha Hydrodrome (Mahmoud et al, 2013) and in Edku Lake (Khalil, 1994 andAbd-Alla &Talaat, 2000) and in El-Bahr El-Faroany (El-Kasheif et al, 2015). Table (7) shows different results from the previous studies, moreover, these differences in results may be due to feeding intensity, climate, gonad maturation and other factors.…”

Biological Aspects and Fisheries Management of Tilapia Fish Oreochromis niloticus (Linnaeus, 1758) in El-Bahr El-Faraouny Canal, Al-Minufiya Province, Egypt

“…Edku Lake Drainage Canal Total El-Faraouny canal Alne-na-ei (1986) Khallaf (1987) Mekkawy et al (1994) Tharwat (1995) Abd-Alla and Talaat (2000) Khallaf et al (2003) length Present study Mahmoud et al (2013) length Present study Shalloof, 1991), Lake Nasser (2.39; Mekkawy et al, 1994) and river Nile (2.42;El-Kasheif, 2003) indicate the general stress on fish population of that species in this canal. In accordance, with earlier studies, similar results were also attributed to the high levels of pollution (Lowe-McConnell, 1975, 1987Sindermann, 1979Sindermann, , 1990.…”

“…Various endogenous and exogenous factors influence fish growth (Helfman et al, 2009), as food and temperature prevailing in these areas (Bruton, 1990;Weatherley and Gill, 1987) and these might be responsible for the observed differences (Offem et al, 2012). Also, the method of sampling can affect the calculated biological parameters (Mahmoud et al, 2013).…”

Maturity, growth and natural mortality rate of the introduced fish Parachromis managuensis (Perciformes: Cichlidae) in the semiarid region of Brazil

“…In general, natural mortality rates for tropical fishes like P. managuensis tend to be higher due to multiple factors, such as predation and diseases that affect the population in different ways according to age (Pauly, 1998;Sparre & Venema, 1997). Mortality parameters for P. managuensis were higher than those established for other cichlid species (Ruffino & Isaac, 1995;Mahmoud et al, 2013), even though it is considered as resistant and fast-adapting to abiotic factors such as oxygen concentration and pH fluctuations. Furthermore, it also exhibits parental care, which contributes to reduce its mortality (Berghe & Mckaye, 2001;Agasen et al, 2006;Rosana et al, 2006).…”