Protein digestion and ion concentrations in rainbow trout (Salmo gairdnerii Rich.) digestive tract in sea- and fresh water

Dąbrowski, Konrad; Leray, Claude; Nonnotte, G.; Colin, Didier

doi:10.1016/0300-9629(86)90084-8

Cited by 46 publications

(38 citation statements)

References 44 publications

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“…The digestibility of dietary protein decreased significantly in rainbow trout (MacLeod, 1977;Lall and Bishop, 1979), in Atlantic salmon (Usher et ai, 1990), or in Arctic charr (Ringo, 1991) with an increasing of salinity. On the other hand, salinity had no significant effect on protein digestibility in rainbow trout (Dabrowski et al, 1986;Brauge et ai, 1995). In the present study salinity had no significant effect on carotenoid digestibility in rainbow trout despite the fact that digestibility of carotenoids in fish reared in fresh water has a tendency to be higher than those in fish reared in seawater.…”

Section: Dietsmentioning

confidence: 99%

Digestibility of astaxanthin and canthaxanthin in rainbow trout as affected by dietary concentration, feeding rate and water salinity

Choubert¹,

Storebakken²

1996

Ann. Zootech.

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Summary — The digestibility of astaxanthin and canthaxanthin in rainbow trout was studied in two different experiments. In the first experiment, the trout were fed, at a rate of 1.0% body weight/day (BW/d), diets containing various concentrations (12.5, 25, 50, 100 and 200 mg carotenoid/kg feed) of astaxanthin or canthaxanthin in fresh water. The overall apparent digestibility of astaxanthin was higher than that of canthaxanthin whatever the dietary concentration of the carotenoid. Apparent digestibility coefficients were maximum for astaxanthin (79.1 ± 1.3%) at 25 mg/kg feed and for canthaxanthin (68.6 ± 2.8%) at 50 mg/kg feed, and then decreased at higher dietary levels of carotenoids. In the second experiment, only diets containing 25 or 50 mg carotenoid/kg feed of either of the two carotenoids were fed to trout in fresh water at feeding rates of 0.5, 1.0 and 1.5% BW/d, and in sea water (30-32 ppt) at a rate of 1.0% BW/d. Neither the feeding rate nor the salinity affected the digestibility of the two carotenoids.astaxanthin / canthaxanthin / digestibility / trout / feeding rate / salinity Résumé — Digestibilité de l'astaxanthine et de la canthaxanthine chez la truite arc-en-ciel.Effet de la concentration alimentaire, du taux de rationnement et de la température de l'eau. Les digestibilités de l'astaxanthine et de la canthaxanthine chez la truite arc-en-ciel ont été étudiées au cours de deux expériences différentes. Dans la première, des truites, élevées en eau douce, ont reçu, à un taux de rationnement de 1,0 % de leur poids corporelljour (PVljour), un aliment contenant différentes concentrations (12,5, 25, 50, 100 (30-32 % o ), à un taux de 1,0 % PV/jour, Ni le taux de rationnement ni la salinité de l'eau n'ont affecté la digestibilité des deux caroténoides.astaxanthine / canthaxanthine / digestibilité / truite / taux de rationnement / salinité

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Section: Dietsmentioning

confidence: 99%

Digestibility of astaxanthin and canthaxanthin in rainbow trout as affected by dietary concentration, feeding rate and water salinity

Choubert¹,

Storebakken²

1996

Ann. Zootech.

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“…The intestine (or pyloric ceca, when present) absorbs Na + , Cl ) , Ca 2+ , and Mg 2+ (and probably other ions) that is present in the food (Dabrowski et al 1986;Bogé et al 1988;Baldisserotto et al 1993;Kerstetter and White 1994;Baldisserotto and Mimura 1995;Bijvelds et al 1998). The intestine also has to reabsorb ions discharged by gastric secretion (such as Cl ) ) (Hirano and Mayer-Gostan 1976) as well as by bile when fat enters the intestine.…”

Section: Introductionmentioning

confidence: 96%

“…The intestine also has to reabsorb ions discharged by gastric secretion (such as Cl ) ) (Hirano and Mayer-Gostan 1976) as well as by bile when fat enters the intestine. The intestine of several species of freshwater teleosts either absorbs (Smith 1964;Skadhauge 1969;Nakamura 1985;Baldisserotto et al 1996b) or does not transport K + (Dabrowski et al 1986;Baldisserotto et al 1993).…”

Section: Introductionmentioning

confidence: 98%

Ion levels in the gastrointestinal tract content and plasma of four teleosts with different feeding habits

Becker

Gonçalves

Garcia

et al. 2006

Fish Physiol Biochem

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The levels of various ions (Na + , Cl ) , Ca 2+ , Mg 2+ , K + ) in the fluid phase of the gastrointestinal contents and of the plasma were determined in four teleosts with different feeding habits: traira (Hoplias malabaricus), hassar (Hoplosternum littorale), silver catfish (Rhamdia quelen), and grass carp (Ctenopharyngodon idella). The results showed that most ionic levels in the fluid phase of the gastrointestinal tract seem to be affected by feeding habit and that these levels can be different from those found in the plasma. In practical terms, these results suggest that ionic levels of the gastrointestinal contents should be considered when preparing solutions for studies of intestinal absorption in fishes.

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“…Although significant work has been done regarding the effects of feeding on physiology in other vertebrate groups, similar studies of fishes have been less comprehensive or are specifically designed to meet aquaculture goals. Dabrowski et al (Dabrowski et al, 1986) found that feeding in seawater and freshwater drastically changes the ionic balance in the euryhaline fish intestine, even though the salt intake that accompanies drinking in seawater fish largely surpassed dietary intake (Shehadeh and Gordon, 1969;Dabrowski et al, 1986). The acute nature of dietary salt intake may in itself induce an osmoregulatory challenge for the gastrointestinal tract.…”

Section: Introductionmentioning

confidence: 99%

Feeding and osmoregulation: dual function of the marine teleost intestine

Taylor

Grosell

2006

Journal of Experimental Biology

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SUMMARY Experiments on Gulf toadfish Opsanus beta demonstrate how feeding impacts osmoregulation in the marine teleost intestine. A high Ca2+diet of pilchards Sardina pilchardus ([Ca2+]=404.2 mmol kg-1) was compared to a low Ca2+ diet of common squid Loligo forbesi ([Ca2+]=1.3 mmol kg-1), as high[Ca2+] has been shown to stimulate intestinal anion exchange. Gastrointestinal fluids and blood plasma were collected over a time course from pre-feeding to 216 h post feeding. Following food intake, monovalent ions were largely absorbed across the intestinal epithelium, leaving a fluid rich in divalent ions, which have a lower osmotic coefficient and effectively reduce osmotic pressure in the lumen to allow for enhanced fluid absorption. Concentrations of Cl- and HCO -3 in fluid along the gastrointestinal tract of fish fed both diets, particularly 1 and 2 days post-feeding, demonstrate that apical Cl-/HCO -3 exchange plays a vital role in postprandial Cl- and water absorption. Postprandial acid-base balance disturbance as indicated by plasma alkalinization was limited or absent,indicating compensation for gastric acid secretion in this teleost fish. Plasma osmolality peaked 12 h post-feeding in toadfish fed squid, but was not accompanied by a significant increase in inorganic ion concentrations. Transient fluid secretion by the gastrointestinal tract was evident from reduced luminal Mg2+ and SO 2-4concentrations for 24-48 h post feeding. Discrepancy between the sum of inorganic osmolytes and measured osmotic pressure was attributed to organic osmolytes, which occurred at high concentrations in the stomach and anterior intestine for up to 24 h post feeding.

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Protein digestion and ion concentrations in rainbow trout (Salmo gairdnerii Rich.) digestive tract in sea- and fresh water

Cited by 46 publications

References 44 publications

Digestibility of astaxanthin and canthaxanthin in rainbow trout as affected by dietary concentration, feeding rate and water salinity

Digestibility of astaxanthin and canthaxanthin in rainbow trout as affected by dietary concentration, feeding rate and water salinity

Ion levels in the gastrointestinal tract content and plasma of four teleosts with different feeding habits

Feeding and osmoregulation: dual function of the marine teleost intestine

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