The Biology and Culture of Tilapias
(e.g. man-made lakes). This transformation, however, affects not only current velocity but also the depth per se, the thermal re ...
which corresponds well to the naturally occurring minimum in Lake Huleh. Hauser (1977) also reports a minimum temperature for re ...
S. andersonii S. aureus S. esculentus S. galilaeus S. alcalicus grahami S. leucostictus S. macrochir S. melanotheron S. mortimer ...
Table 5. Tilapias indigenous or introduced with success in high altitude lakes in Africa (C20 = conductivity at 20°C in pS/cm; * ...
Experimental studies, aquacultural and field observations (Balarin and Hatton 1979) demonstrate that many tilapias which are not ...
Several tilapias are euryhaline, able to live and reproduce at salinities higher than 30%0. These occur naturally in estuaries a ...
because of its inability to tolerate salinities above 19%0 that T. rendalli never succeeded in colonizing, by way of estuaries, ...
pH AND ALKALINITY S. alcalicus grahami in Lake Magadi tolerates a pH of 10.5 and an alkalinity of 80 g CaC03/1 (Coe 1969; Reite ...
oxygen supersaturation (up to 400% in Lake Chilwa, Morgan 1972). Super- saturation of dissolved gases (oxygen and also nitrogen) ...
In general a comparison of feeding in the same species of tilapia in a large range of water bodies reveals a very great variabil ...
debris and phytoplankton, which seems on the whole to be ingested passively rather than sought actively. S. galilaeus feeds much ...
S. galilaeus (Fishelson and Heinrich 1963; Iles and Holden 1969) S. karomo (Lowe (McConnell) 1956a) S. leucostictus (Lowe (McCon ...
reproduction during part of the year, the length of time depending on the latitude and altitude of the place: the duration of th ...
Table 6 (cont'd) Lake Victoria 03~00'S-0~20'N, 1,136 m Fryer (1961a) indicated that the reproduction of S. variabilis is continu ...
the one depositing a batch of eggs, the other covering them with milt, and the application forms a plaque of spawn composed of s ...
in schools of several hundred individuals, notably in S. variabilis (Fryer and Iles (1972), S. lidole (Lowe (McConnell) 1957) an ...
offering optimal conditions for survival of the young (protection against predators and exploitation of the best physical sites ...
In taking into account the eco-ethology of reproduction, it is often possible to explain subsequently, or to foresee, the differ ...
Microhabitats and the Dynamics of Spatial Separation Information on spatial separation (horizontal, vertical) of numerous tilapi ...
rapids and fast-flowing water and preferred still water and pools. In the same way, electric fishing in the Shire River, Malawi ...
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