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Titolo:
FOOD-DEPRIVATION AFFECTS SEAWATER ACCLIMATION IN TILAPIA - HORMONAL AND METABOLIC CHANGES
Autore:
VIJAYAN MM; MORGAN JD; SAKAMOTO T; GRAU EG; IWAMA GK;
Indirizzi:
UNIV BRITISH COLUMBIA,DEPT ANIM SCI VANCOUVER BC V6T 1Z4 CANADA UNIV BRITISH COLUMBIA,CANADIAN BACTERIAL DIS NETWORK VANCOUVER BC V6T1Z4 CANADA UNIV HAWAII,HAWAII INST MARINE BIOL KANEOHE HI 96744
Titolo Testata:
Journal of Experimental Biology
fascicolo: 11, volume: 199, anno: 1996,
pagine: 2467 - 2475
SICI:
0022-0949(1996)199:11<2467:FASAIT>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMINO-ACID UTILIZATION; OREOCHROMIS-MOSSAMBICUS; GROWTH-HORMONE; RAINBOW-TROUT; HEPATOCYTE METABOLISM; CHLORIDE CELLS; 2 PROLACTINS; FRESH-WATER; ONCORHYNCHUS-KISUTCH; SPAWNING MIGRATION;
Keywords:
OREOCHROMIS MOSSAMBICUS; TILAPIA; STRESS; METABOLISM; FOOD-DEPRIVATION; CORTISOL; GROWTH HORMONE; PROLACTIN; GILL NA+/K+-ATPASE; ION REGULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
M.M. Vijayan et al., "FOOD-DEPRIVATION AFFECTS SEAWATER ACCLIMATION IN TILAPIA - HORMONAL AND METABOLIC CHANGES", Journal of Experimental Biology, 199(11), 1996, pp. 2467-2475

Abstract

We tested the hypothesis that nutritional state affects seawater acclimation by transferring either fed or food-deprived (2 weeks) male tilapia (Oreochromis mossambicus) from fresh water to full-strength sea water. Food-deprivation resulted in a significant increase in plasma concentrations of Na+, Cl-, cortisol, glucose, total amino acid, glutamate, serine and alanine, and in hepatic pyruvate kinase (PK) and lactate dehydrogenase (LDH) activities, whereas the prolactin-188 to prolactin-177 ratio (tPRL(188):tPRL(177)) and plasma prolactin-188 (tPRL(188)), lactate, arginine and hepatic glycogen content and hepatic alanine aminotransferase (AlaAT) and 3-hydroxyacyl-Coenzyme A dehydrogenase (HOAD) activities were lower than in the fed group. Seawater transfer significantly increased the tPRL(188):tPRL(177) ratio and plasma concentrations of Na+, Cl-, K+, growth hormone (GH), glucose, aspartate, tyrosine, alanine, methionine, phenylalanine, leucine, isoleucine and valine levels as well as gill Na+/K+-ATPase activity and hepatic PK and LDH activities, whereas plasma tPRL(177), tPRL(188), glycine and lysine concentrations were significantly lower than in fish retained in freshwater. There was a significant interaction between nutritional state and salinity that affected the tPRL(188):tPRL(177) ratio and plasma concentrations of Cl-, GH, glucose, aspartate, tyrosine, serine, alanine, glycine, arginine and hepatic PK, LDH, AlaAT, aspartate aminotransferase, glutamate dehydrogenase and HOAD activities. These results, taken together, indicate that food-deprived fish did not regulate their plasma Cl- levels, despite an enhancement of plasma hormonal and metabolic responses in sea water. Our study also suggests the possibility that plasma prolactin and essential amino acids may be playing an important role in the seawater acclimation process in tilapia.

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Documento generato il 26/09/20 alle ore 10:11:19