Studies on the Digestive Enzymes of Rainbow Trout-Iii

Abstract

In succession to the previous reports on carbohydrases1) and proteases2) , the tributyrin

Lipase activity in different tissues of four species of fish: rohu (Labeo rohita Hamilton), oil sardine (Sardinella longiceps Linnaeus), mullet (Liza subviridis Valenciennes) and Indian mackerel (Rastrelliger kanagurta Cuvier)

“…No significant difference in stomach and pyloric caeca lipase activity was observed between groups 2 and 3 ( p < 0.05). A report on rainbow trout indicates that, in general, esterase activity increased with growth, but the highest activity was found in medium‐sized fish 16. The differences in activity among the three size groups of mullet may be due to differences in feeding habits,17 food composition18 and/or physiological status of the fish with respect to their growth.…”

“…Lipase activity was found to vary significantly in stomach and pyloric caeca of the four species. This variation may be due to differences in feeding habits,21 composition of diet,22 substrate specificity of lipase23 and/or volume of pyloric caeca 16…”

Enzyme Histochemical and Ultrastructural Observations on the Liver of Teleost Fishes

“…This finding indicates that possibly the production of bile is reduced or follows different patterns in the teleosts, since lysosomes are thought to play a role in the transport of biliary pigments (DVORAK and HORKY, 1967). KITAMIKADO and TACHINO (1961) found high concentrations of esterases in the bile of the rainbow trout.…”

Lipid digestion in turbot (Scophthalmus maximus). I: Lipid class and fatty acid composition of digesta from different segments of the digestive tract

“…Consequently, lipase activity that are subsequently absorbed in the intestinal wall has been detected in the digestive tract of various of the jejunum (Gurr and Harwood 1991). Almarine fish species (Chesley 1934;Kitamikado and though the teleost pancreas is generally diffuse, fish Tachino 1961 ;Brockerhoff 1966;Sastry 1974; digestive lipases were assumed to be similar to Mukhopadhyay 1977; Olatunde and Ogunbiyi mammalian lipases (Brockerhoff 1966) and this was demonstrated in several species (Brockerhoff and Hoyle 1965;Brockerhoff 1966;Tocher and Sargent 1984). It followed that lipid digestion and absorption were shown to take place primarily in the anterior intestine (Mukhopadhyay 1977;Fange and Grove 1979;Buddington and Doroshov 1986;Das et al 1987;Borlongan 1990).…”