The effect of feeding on the secretion of pepsin, trypsin and chymotrypsin in the Atlantic salmon,Salmo salar L

Einarsson, S.; Davies, Phil; Talbot, C.

doi:10.1007/bf01875587

Cited by 42 publications

(25 citation statements)

References 23 publications

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“…This could be explained considering that the duodenal portion of the intestine is the place where the pancreatic enzymes are released. This should be in agreement with results obtained in different studies comparing herbivorous, omnivorous and carnivorous fishes, which have reported higher trypsin activity in the proximal region of the intestine (Hofer and Schiemer 1981;Bitterlich 1985;Chakrabarti et al 1995;Einarsson et al 1996). Higher trypsin activity in the anterior intestine may enhance the hydrolysis of protein for amino acid absorption, particularly for herbivores and omnivores, which feed on a diet low in protein and nitrogen (Hofer and Schiemer 1981;Bitterlich 1985).…”

Section: Discussionsupporting

confidence: 85%

Assessment of enzymatic efficiency on protein digestion in the tilapia Oreochromis niloticus

Uscanga

Moyano

Álvarez

2010

Fish Physiol Biochem

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The present study develops an experimental procedure aimed to estimate the efficiency of protein digestion in fish by measuring both gut transit rate and total amount of the main intestinal proteases (trypsin and chymotrypsin). The selected species was the Nile tilapia (Oreochromis niloticus). Total time for digestion, calculated through the estimation of gut transit rate using differently colored feeds, was 7.15 h. Mean production of trypsin and chymotrypsin was 15.94 and 24.11 mU in the proximal intestine and much lower (2,39, 4.90 mU) in the distal intestine. The enzyme efficiency, calculated from the average enzyme activity and time of residence of the digesta in each intestinal section, points to the major role of proximal intestine in protein digestion for this species. Results are discussed in relation to the main features characterizing digestion in stomachless fish.

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Section: Discussionsupporting

confidence: 85%

Assessment of enzymatic efficiency on protein digestion in the tilapia Oreochromis niloticus

Uscanga

Moyano

Álvarez

2010

Fish Physiol Biochem

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“…Secretion of protease is proposed to be a response to protein or free amino acids intake (Einarsson et al , 1996; Koven et al , 2002). Consequently, a significant reduction in activity can be directly related to an insufficient supply of these substrates, which should result in poor growth and survival.…”

Section: Discussionmentioning

confidence: 99%

Trypsin and chymotrypsin as indicators of nutritional status of post‐weaned sea bass larvae

Cara¹,

Moyano²,

Zambonino³

et al. 2007

Journal of Fish Biology

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The aim of the present work was to evaluate to what extent variation in the activity of either trypsin or chymotrypsin could be a sensitive and reliable indicator of nutritional deficiencies during post-weaning stages in a marine fish. Sea bass Dicentrarchus labrax larvae obtained from two different spawns classified as high quality (HQ) or low quality (LQ) on the basis of their hatching variables, were used to evaluate if enzyme production could be conditioned by factors other than those related to the feeding regime. In addition, larvae in each group were either fed normally or received a ration reduced by 60%. Trypsin and chymotrypsin activities were separately measured in larvae at days 3 and 15 after weaning. Changes in mass and final survival were also recorded. Food limitation resulted in a lower final mass only in the HQ larvae. Survival was significantly higher in HQ larvae, but also in larvae suffering food restriction, irrespective of the quality of the spawn. In both groups of larvae, lower food availability was correlated to increased values of trypsin, and particularly, of chymotrypsin. Variations were high enough to support the usefulness of such enzymes as indicators of a modified nutritional status. It is suggested that the noticeable increase in the activity of both enzymes observed in the restrictedly fed larvae could compensate initial deficiencies and explain the good results in growth and survival obtained in LQ larvae.

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“…The constant activity of pepsin in the stomach tissue might be explained by its fast post‐prandial synthesis activity, which did not seem to be affected by lower temperatures. In contrast to trypsin and chymotrypsin, pepsin is rapidly synthesized and secreted with the onset of feeding (Einarsson, Davies & Talbot 1996).…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in proteolytic enzymes of yellowtail Seriola quinqueradiata (Temminck & Schlegel; Carangidae) fed extruded diets containing different protein and energy levels

Kofuji

Akimoto²,

Hosokawa

et al. 2005

Aquac Research

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Seasonal variations in pepsin, trypsin and chymotrypsin activities and protein digestibility were studied in yellowtails (Seriola quinqueradiata) reared for 1 year with extruded diets containing different levels of protein. Trypsin and chymotrypsin storage levels in the digestive tissues of starved fish were affected by seasonal changes in water temperature. Actual digestion activities of trypsin and chymotrypsin were low at lower water temperatures, but pepsin activity in the stomach tissue was not affected by low temperatures. On the other hand, trypsin and chymotrypsin activities in the intestinal contents were higher during lower water temperature months, while pepsin activity in the stomach contents was low at lower water temperatures. Apparent protein digestibility (APD) did not differ among the dietary treatments in the higher water temperature months, while in colder months it was higher in fish fed diet 1 than in fish fed diets 2 and 3. The APD values reflected pepsin activity in the stomach contents in all sampling months. Therefore, lower APD in colder months seems to be attributed to lower protease activity in the gastric digesta, implying that enhanced pepsin secretion from the stomach tissue might improve protein digestibility and growth performance in yellowtails during winter.

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The effect of feeding on the secretion of pepsin, trypsin and chymotrypsin in the Atlantic salmon,Salmo salar L

Cited by 42 publications

References 23 publications

Assessment of enzymatic efficiency on protein digestion in the tilapia Oreochromis niloticus

Assessment of enzymatic efficiency on protein digestion in the tilapia Oreochromis niloticus

Trypsin and chymotrypsin as indicators of nutritional status of post‐weaned sea bass larvae

Seasonal changes in proteolytic enzymes of yellowtail Seriola quinqueradiata (Temminck & Schlegel; Carangidae) fed extruded diets containing different protein and energy levels

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