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Titolo:
Cellular and biochemical characterization of hyposmotic adaptation in a marine teleost, Sparus sarba
Autore:
Kelly, SP; Woo, NYS;
Indirizzi:
Chinese Univ Hong Kong, Dept Biol, Shatin, NT, Hong Kong Chinese Univ HongKong Shatin NT Hong Kong t Biol, Shatin, NT, Hong Kong
Titolo Testata:
ZOOLOGICAL SCIENCE
fascicolo: 3, volume: 16, anno: 1999,
pagine: 505 - 514
SICI:
0289-0003(199906)16:3<505:CABCOH>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MITOCHONDRIA-RICH CELLS; TILAPIA OREOCHROMIS-MOSSAMBICUS; K+ ATPASE ACTIVITY; CHLORIDE CELLS; FRESH-WATER; SEAWATER ADAPTATION; EURYHALINE FISH; SEA-WATER; GILL; SALINITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Woo, NYS Chinese Univ Hong Kong, Dept Biol, Shatin, NT, Hong Kong Chinese Univ Hong Kong Shatin NT Hong Kong hatin, NT, Hong Kong
Citazione:
S.P. Kelly e N.Y.S. Woo, "Cellular and biochemical characterization of hyposmotic adaptation in a marine teleost, Sparus sarba", ZOOL SCI, 16(3), 1999, pp. 505-514

Abstract

Silver sea bream (Sparus sarba) were adapted to a hyposmotic environment of 6 parts per thousand for 5 or 21 day periods. Hyposmotic adaptation did not significantly alter serum Na+, Cl- or muscle moisture content. After 5 days in 6 parts per thousand, chloride cell (CC) apical and fractional areasincreased with no alteration in CC numbers. Elevated CC apical and fractional area was coupled with an increase in CC numbers after 21 days in 6 parts per thousand. In fish adapted to 6 parts per thousand, an increase was found in the area of CC cytoplasm occupied by mitochondria. Branchial Na+-K+-ATPase decreased after 21 days in 6 parts per thousand,, resulting in an uncoupled "typical" correlative relationship between this enzyme and CC numbers. Kidney Na+-K+-ATPase activity elevated after 5 days in 6 parts per thousand but was not significantly elevated after 21 days. In gill and kidney tissue, alterations were found in the activity of key metabolic enzymes after 5 days acclimation to 6 parts per thousand, with few differences occurring after 21 days. Serum cortisol levels were unaltered by low salinity acclimation suggesting that an increase in the number of CCs found in 6 parts per thousand-adapted S. sarba did not occur as a result of hypercortisolemia. Based on the present evidence, it seems possible that alterations in the form and function of the branchial epithelium may play an important role in the ability of S, sarba to acclimate to low salinity conditions, with renalassistance occurring during short term exposure. The response of S, sarba to low salinity adaptation appears to differ from the generally accepted teleostean model of response and offers insight into the as yet undefined hyperosmoregulatory strategies of estuarine marine migrant fish.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:43:32