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Conditions of African Sharptooth Cat Fish De-heading Process®

100%

Fatyhov Û. A. , Diakun J. , Skarbek E. , Domiszewski Z.

Postępy Techniki Przetwórstwa Spożywczego

2021

tom nr 1

11--16

This article discusses aspects of the de-heading in terms of mechanical nuisance and technological and material efficiency. The specificity of the carcass structure and the skeletal system of the head and spine of the African sharptooth catfish is presented. The conditions, possibilities and limitations of African catfish de-heading are analysed due to its structure.

W artykule omówiono znaczenie operacji odgławiania ze względu na uciążliwość mechaniczną i wydajność technologiczno-materiałową. Przedstawiono specyfikę budowy tuszy i układu kostnego głowy i kręgosłupa suma afrykańskiego. Przeanalizowano uwarunkowania, możliwości i ograniczenia odgławiania suma afrykańskiego ze względu na jego budowę.

Mode of attachment and histopathological effects of Macrogyrodactylus clarii, a monogenean gill parasite of the catfish Clarias gariepinus, with a report on host response

63%

Arafa S. Z. , El-Naggar M. M. , El-Abbassy S. A.

tom 54

nr 2

103-112

A detailed account is given about the mode of attachment and histopathological effects of Macrogyrodactylus clarii Gussev, 1961, a viviparous monogenean from the gills of the catfish Clarias gariepinus. Most parasites attach their haptors to the proximal region of the gill filament (primary gill lamellae), while few specimens were seen attached to the distal region. Attachment of the haptor was achieved mainly by the blade of the hamuli, but no evidence was found indicating the participation of marginal hooklets in the attachment. The hamuli of M. clarii penetrate into the interlamellar epithelium of the gill tissue. Some evidences were found to indicate that M. clarii may also utilize suction force during haptoral attachment. The pathological effects of M. clarii are manifested by breakdown of the coating epithelium, necrosis of the epithelial cells, vacuolations inside and outside the host cells, fusion of the gill lamellae, rupture of blood capillaries, infiltration of erythrocytes and degeneration and fibrosis of the interlamellar epithelium. The host response includes the appearance of lymphocytes, mucoid secretions and hyperplasia of the tissue at the site of attachment.

A new identification method for Clarias gariepinus, Clarias macrocephalus and their hybrids using PCR-RFLP

63%

Panicz R. , Sadowski J. , Hofsoe-Oppermann P. , Polgesek M.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

2018

tom 21

nr 4

Acute and sub lethal effect of potassium cyanide on the behaviour and ATPase enzyme activity in the freshwater fish, Clarias gariepinus (Catfish)

51%

Oseni K.

International Letters of Natural Sciences

2015

tom 49

The Present research studies the acute sub lethal toxicity of potassium cyanide (KCN) in the fresh water, Clarias gariepinus and the effects on its behaviour and the Na+ - K+ ATPase enzyme activity. Acute toxicity of potassium cyanide (free cyanide) to the freshwater fish was studied using static bioassay method over a period of 96 h. Different concentrations of the toxicant (KCN) were used and LC50 value was found to be 361μg/L. Behavioural changes when exposed to lethal concentration of KCN showed increased feed intake, cannibalism, irregular swimming activity, rapid jerk movement, aggressiveness, loss of balance, opercula movement, surface behaviour, loss of equilibrium, change in body colour and convulsion. The effect of potassium on the Na+ - K+ ATPase of various physiological tissues which includes the gill, liver, muscles and intestinal over duration 0f 12 h- 35 days were also studied. Cyanide intoxication resulted in marked changes in ATPase, shown by significant decrease in the enzyme activities. The result shows that ATPase enzyme together could be employed as a sensitive and useful biomarkers for cyanide pollution while the behavioural changes could be an early signal of toxicity.