The Biology and Culture of Tilapias
Table 4. The spawning frequency and egg production of Sarotherodon aureus females in interspecific spawning crosses with S. nilo ...
Table 6. Fry production (Sarotherodon niloticus? x S, aureus d hybrids) from 3 spawn- ing ponds at Ein Hamifrats fish farm over ...
ponds, using a 1:l sex ratio and counting all small fry, never exceeded 1,500 frylfemale. The normal average production, using a ...
In the immediate future it seems that the mass production of hybrid tilapia fry will still depend on the number of spawners used ...
CHERVINSKI: Perhaps by doing this we are getting rid of some waterborne chemical factor pmduced during reproduction which at hig ...
LOVSHIN: I have no way of telling from pond work. We should expect larger numbers of eggs from larger fish. MIRES: I have observ ...
General Discussion on the Biology and Culture of Tilapias Compiled by R.S.V. Pullin Abstract A report is given on a wide ranging ...
Sarotherodon spp., although their reproductive behavior has not been fully described. Dr. Trewavas speculated that the present s ...
Plate 1. Typical S. mossambicus from lowerlmiddle Zarnbezi. Photo by M.S. Caulton. Plate 2. S. mossaliabicus introduced in the F ...
In some natural waters which have received multiple introductions, e.g., Lake Naivasha, the tilapia populations have changed yea ...
Establishment and Conservation of Pure Strains Very few pure strains of tilapias are available to culturists. Only where stocks ...
Prof. Roberts gave a very useful example of the confusion which can arise if the last of these objectives is not fulfilled. At S ...
when the water rises. In Lake Valencia (Venezuela), again the cichlid popula- tion is found only around the periphery where they ...
338 ' non-fe&ing period. Many plants and animals adjust their life-history strategy to maximize the intrinsic growth rate of ...
'expectation' of mortality is more difficult, however, and can only be expressed in vague terms as stress factors, e.g., oxygen ...
out that a given species usually spawns at a fixed time within a 24-hour cycle in aquarium conditions. There could be scope for ...
Fish culturists were advised to take note of the very slow passage of food through the tilapia intestine during non-feeding peri ...
Dr. Caulton described the digestive physiology of T. rendalli for com- parison. The most important aspect of this is the rasping ...
contains very significant amounts of these nitrogenous compounds in addition to microbial protein. Dr. Moriarty questioned the m ...
Dr. Bowen pointed out that detritivorous fish are very selective feeders in natural waters and suggested that a painstaking appr ...
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