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This study was aimed at profiling plasma proteins of healthy 8-month-old African catfish. Plasma proteins within the isoelectric point ranging from 3.0 to 10.0 were separated by high resolution two-dimensional electrophoresis (2-DE). In total, 8 different gene products were identified with a matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer. These included carrier proteins (fatty acid-binding protein 1, metallothionein, mitoferrin-2), a structural protein (vimentin), proteins involved in the regulation of transcription (thyroid hormone receptor alpha A, endothelial differentiation-related factor 1 homolog), and others (B-cell lymphoma 6 protein homolog, FGFR1 oncogene partner 2 homolog). This is the first study attempting to map the plasma proteome of Clarias gariepinus. Owing to the lack of information concerning catfish protein sequences in the relevant databases, protein spots were identified by matching peptide data to interspecies homology. The results of this preliminary study may encourage other authors to undertake further research on the plasma proteome of the African catfish.
Ze względu na ograniczony zasób wiedzy na temat wpływu transportu na materiał obsadowy suma afrykańskiego (Clarias gariepinus, Burchell 1822) przeprowadzono badania wpływu transportu narybku w zagęszczeniu 300 gram na 1 litr wody na organizm ryb. W trakcie symulowanego transportu oceniano zmiany podstawowych parametrów fizykochemicznych wody oraz oznaczono podstawowe wskaźniki fizjologiczne organizmu ryb. Uzyskane wyniki wskazują, że transportowanie materiału obsadowego suma w testowanych warunkach nie powoduje istotnego zaburzenia homeostazy organizmu i nie powinno mieć negatywnego wpływu na dalszy proces chowu tego gatunku ryb.
Experiments to assess the effectiveness of the immunostimulator methisoprinol (Polfa Grodzisk Pharmaceuticals, Poland) focused on its impact on the innate immune response. The impact of different doses of methisoprinol on organ leukocytes isolated from the kidneys and spleens of African catfish that were subjected to or not subjected to the suppressive impact of iridovirus. The results indicate that the addition of methisoprinol causes increased respiratory burst activity (RBA), potential killing activity (PKA), and proliferative activity of lymphocytes T and B in response to mitogens. Methisoprinol stimulates the mechanisms of cellular immunity that are linked to the activation of T lymphocytes, which can impact the antiviral activity of this preparation after its application in vivo.
Using column and thin layer chromatography, carotenoid contents were determined in the African sharptooth catfsh (Clarias gariepinus Burchell).
Six diets made from purified and semi-purified materials (casein, gelatin, gluten, zein, dextrin, α-cellulose) were tested over an 80-day period in adult (150 ± 47.40 g) African catfish, Clarias gariepinus (Burchell). Six protein to lipid ratios were tested ranging from 12.85 mg protein kJ⁻¹ to 20.51 mg protein kJ⁻¹. Performance indices (PWG, SGR, FCR) compare favorably with those previously observed for C. gariepinus and other clariid species. The best performing diets were those with a total gross energy range of 22 to 24 kJ g⁻¹, a P/E ratio of 19.5 - 20.5 mg protein kJ⁻¹, a crude protein level of 46%, a crude lipid level of 10-17%, and a carbohydrate level of 26 - 32%. The carbohydrate levels (26 - 32%) of the best performing diets during these experiments were much higher than those of previous researchers (16 - 18%) for the same species and still higher than those (15 - 25%) employed for other carnivores (salmonids, sea bass, sea bream). Therefore, African catfish possibly exhibits more efficient dietary carbohydrate utilization. An increase in carcass lipid as a result of increased dietary non-protein energy was also recorded.
Some organs of the reproductive system of the protogynous monogenean skin parasite Macrogyrodactylus congolensis (Prudhoe, 1957) Yamaguti, 1963 have been studied using transmission electron microscopy. The vesicula seminalis is enclosed by a prominent layer of circular muscle fibres and has inner syncytial protrusions. The penis bulb is a highly muscular organ with prominent radial and circular muscle fibres, a gutter-shaped large spine and 16 small spines. Two syncytial male accessory glands, and a single reservoir for male accessory secretion were identified. The secretory bodies in the male accessory glands and male accessory reservoir have a unique structure. A large oocyte is situated in a chamber, previously referred to as the “ootype” or “egg-cell-forming region” (ECFR), which also contains one or two small undifferentiated cells and vacuolated tissue. Mature spermatozoa were abundant in the receptaculum seminis and dispersed in the vacuolated tissue in the ECFR and appeared to be attached to the membrane of the large oocyte. Mature spermatozoa were also seen in the parenchymal tissue near the chamber containing embryos and even in the tissues of the embryo.
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