Increased seawater survival and contribution to the fishery of chinook salmon (Oncorhynchus tshawytscha) by supplemental dietary salt

Zaugg, Waldo S.; Roley, Dennis D.; Prentice, Earl F.; Gores, Kurt X.; Waknitz, F. William

doi:10.1016/0044-8486(83)90280-6

Cited by 52 publications

(28 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, it was previously reported that feeding a saltenriched diet to Chinook salmon Oncorhynchus tshawytscha (Zaugg et al, 1983), rainbow trout (Salman and Eddy, 1990) or brook charr Salvelinus fontinalis (Pellertier and Besner, 1992) significantly improved their survivability upon transfer to SW. Based on the results of the present study, we suggest that the mechanism underlying the increased survivability is salt-induced structural and molecular re-modelling of the gill into a partial SW phenotype.…”

Section: Discussionmentioning

confidence: 99%

Fooling a freshwater fish: how dietary salt transforms the rainbow trout gill into a seawater gill phenotype

Perry

Rivero-Lopez

McNeill

et al. 2006

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARY Numerous fish species, including rainbow trout (Oncorhynchus mykiss), are able to inhabit both freshwater and seawater and routinely migrate between the two environments. One of the most critical adjustments allowing such successful migrations is a remodelling of the gill in which a suite of morphological and molecular changes ensure optimal function in the face of reversing requirements for salt and water balance. The remodelling leads to specific freshwater and seawater gill phenotypes that are readily identified by the orientation and/or quantities of specific ion transporters and the presence or absence of specific cell types. The proximate cues promoting gill phenotypic plasticity are unknown. Here, by assessing the consequences of a salt-enriched diet (in the absence of any changes in external salinity) in the freshwater rainbow trout, we demonstrate that internal salt loading alone, is able to induce various elements of the seawater gill phenotype. Specifically, we show upregulation of three ion transport genes, cystic fibrosis transmembrane conductance regulator (CFTR),Na+/K+/2Cl- co-transporter (NKCC1) and Na+/K+-ATPase, which are essential for ionic regulation in seawater, and the appearance of chloride cell-accessory cell complexes,which are normally restricted to fish inhabiting seawater. These data provide compelling evidence that gill remodelling during migration from freshwater to seawater may involve sensing of elevated levels of internal salt.

show abstract

Section: Discussionmentioning

confidence: 99%

Fooling a freshwater fish: how dietary salt transforms the rainbow trout gill into a seawater gill phenotype

Perry

Rivero-Lopez

McNeill

et al. 2006

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…Dietary NaCl supplementation has been used primarily as an acclimatization method to adapt fish to saltwater (Zaugg et al 1983;Hwang et al 1989;Lim et al 2006). …”

mentioning

confidence: 99%

Susceptibility of Nile tilapia (Oreochromis niloticus) fed with dietary sodium chloride to nitrite toxicity

et al. 2011

View full text Add to dashboard Cite

Juvenile Nile tilapia (Oreochromis niloticus) were fed with diets supplemented with 0 or 6% NaCl for 10 weeks. Tilapia were exposed to approximately 21 mg/l nitrite-N after 5 and 10 weeks of feeding to determine the effect of dietary NaCl supplementation on resistance to nitrite toxicity. Fish were sampled before (baseline, pre-exposure) and after 24 h nitrite exposure to determine the effects of dietary NaCl on mortality, hematology (hematocrit, hemoglobin, and methemoglobin), and plasma electrolyte dynamics (nitrite, chloride, sodium, and potassium). After 10 weeks of feeding, tilapia were also challenged with Streptococcus iniae to determine the effect of sodium chloride on immunity. Tilapia fed with the NaCl-supplemented diet had significantly higher weight gain compared with the control group, which was associated with a significant increase in feed intake in the NaCl group. Mortality from nitrite exposure was lower in tilapia fed with the NaClsupplemented diet compared with the control group at 5 and 10 weeks, but the differences were not significant. However, dietary NaCl supplementation caused a significant decrease in plasma nitrite levels after nitrite exposure. The dietary reduction in nitrite may be related to the increase in plasma chloride in the 6% NaCl-supplemented fish. A direct link between the effects of dietary NaCl supplementation on methemoglobin (MetHb) could not be established. Tilapia in this study were subjected to acute nitrite toxicity. Dietary sodium chloride may be more effective in protecting against nitrite toxicity at lower levels of nitrite, but the conditions at which it proves to be effective may be limited and requires further investigation. Feeding NaCl to tilapia did not affect susceptibility to S. iniae or immune function, but nitrite exposure cause a stress-related reduction in non-specific immune function. This is the first study to examine the effects of dietary salt on nitrite toxicity in tilapia.

show abstract

“…The intestine aids in maintaining water and ion balance from dietary salt intake, and the influence of dietary salt on growth (Basulto 1976, Salman & Eddy 1988, Gatlin et al . 1992) and osmoregulation (Zaugg & McClain 1969, Zaugg et al . 1983, Salman & Eddy 1987, Pelletier & Besner 1992 of several species has been examined .…”

Section: Discussionmentioning

confidence: 99%

The influence of salinity and prey salt content on growth and intestinal Na+/K+-ATPase activity of juvenile bluegill,Lepomis macrochirus

1995

View full text Add to dashboard Cite

SynopsisJuvenile bluegill, Lepomis macrochirus, collected from Mississippi coastal drainages were held at 0, 5, and 10%o S and fed diets containing 0, 2, and 4% dietary NaCl . Over a 58 day period, fish from each of the nine treatments (salinity x diet) were fed ad libitum twice daily for 5 min . Mean treatment growth rates did not differ when adjusted for initial wet weights . Hematocrit and intestinal Na + /K+ -ATPase activity also did not differ . All fish maintained in 0%o S had a marginally lower plasma osmolality compared to fish held in 5 and 10%o S. Plasma C1 concentration of fish held in 0%o S receiving the 0% NaCl diet was lower than that of the other eight treatments . Results indicate that coastal juvenile bluegill can exploit waters up to 10%o S while consuming prey items containing up to 4% NaCl with no influence on growth or certain osmoregulatory characteristics .

show abstract

Increased seawater survival and contribution to the fishery of chinook salmon (Oncorhynchus tshawytscha) by supplemental dietary salt

Cited by 52 publications

References 4 publications

Fooling a freshwater fish: how dietary salt transforms the rainbow trout gill into a seawater gill phenotype

Fooling a freshwater fish: how dietary salt transforms the rainbow trout gill into a seawater gill phenotype

Susceptibility of Nile tilapia (Oreochromis niloticus) fed with dietary sodium chloride to nitrite toxicity

The influence of salinity and prey salt content on growth and intestinal Na+/K+-ATPase activity of juvenile bluegill,Lepomis macrochirus

Contact Info

Product

Resources

About