The high cost of fish feed has affected the culturing tilapias and sharptooth catfish in Africa. However, Africa is well endowed with terrestrial insects that can potentially replace fishmeal diets fish. In this paper, nutritional index, availability, selected insect meals are compared. SOLVER function Excel was used to formulate least-cost Musca domestica, Gryllotalpa africana, Schistocerca gr...

Acetylcholinesterase from the heads of insecticide-resistant and -susceptible houseflies (Musca domestica L.) was studied in vitro. The enzymes could not be distinguished electrophoretically, and their behaviour on polyacrylamide-disc-gel electrophoresis was influenced by the presence of Triton X-100 in both the homogenate and the gels. In the absence of detergent, the acetylcholinesterase was ...

Houseflies, Musca domestica, of both sexes from 4 to 7 days old were used. These were reared and maintained by the procedure described earlier (3). Flight muscle mitochondria, or sarcosomes, were isolated by the technique already reported (4, 5). Oxygen consumption measurements were made in a conventional Warburg apparatus. The temperature was 25” and the gas phase was air. Inorganic phosphate ...

The status of resistance to three insecticides (permethrin, stirofos, and methoxychlor), relative to a laboratory-susceptible colony, was evaluated in field populations of house flies, Musca domestica L., collected from two beef cattle feedlots in southeastern Nebraska. Topical application and residual exposure to treated glass surfaces were suitable methods for determining the resistance statu...

Five field populations of Musca domestica L. collected in poultry farms were bioassayed in order to detect possible resistance to the larvicide cyromazine in Brazil. The concentrations used were 0, 0.5, 0.1, 0.2, 0.4, 1, 2, 4 and 8 ppm. Three populations (Petrópolis, RJ, Montes Claros, MG and Promissão, SP) were resistant, while the other two populations (Ibiuna, SP and Monte Mor, SP) were more...

The absorption of a photon by a photoreceptor triggers a small voltage fluctuation termed the 'bump'. Here, in the housefly, I introduce the bispectrum of photoreceptor noise to characterise the bump under dim light. The bispectrum provides explicit phase information and is not contaminated by Gaussian background noise. Over the photon rates examined (<10(4) s(-1)), I show that bumps are minimu...

In the housefly, Musca domestica L., sex is usually determined by a dominant factor, M, located on the Y chromosome. However, there are 'autosomal male' (AM) populations in which the M factor is located on one or more of the five autosomes (I-V) or on X. We examined changes in the frequency of AM and YM males in North Carolina populations of houseflies after 4 years in the laboratory (NC Lab 02...

Soil samples (n=500) collected from different areas of Pakistan were screened for various species of Bacillus by Gram staining, spore staining and by a number of biochemical tests. Seven identified species i.e. B. thuringiensis, B. sphaericus, B. brevis, B. firmus, B. coagulans, B. stearothermophilus and B. megaterium were then administered to the house flies, Musca domestica to ascertain and e...