CORTICOSTEROID AND THYROID RESPONSES OF LARVAL AND JUVENILE TURBOT EXPOSED TO THE WATER-SOLUBLE FRACTION OF CRUDE-OIL

Citation
Sm. Stephens et al., CORTICOSTEROID AND THYROID RESPONSES OF LARVAL AND JUVENILE TURBOT EXPOSED TO THE WATER-SOLUBLE FRACTION OF CRUDE-OIL, Journal of Fish Biology, 50(5), 1997, pp. 953-964
Citations number
40
Categorie Soggetti
Marine & Freshwater Biology
Journal title
ISSN journal
00221112
Volume
50
Issue
5
Year of publication
1997
Pages
953 - 964
Database
ISI
SICI code
0022-1112(1997)50:5<953:CATROL>2.0.ZU;2-0
Abstract
Turbot larvae (24-590 degree C days; 2-32 days post-hatch) and juvenil es (1345 degree C days; 98 days post-hatch), were exposed for 6 h to 2 5, 33 and 50% water-soluble fraction (WSF) of crude oil in either stat ic or flow-through test systems. Larvae showed generalized primary end ocrine responses, identified by elevated whole body cortisol content f rom as early as 2 days post-hatch. In older larvae and juveniles, the response was related to the WSF concentration. This dose-response rela tionship was not apparent in younger and yolk-sac larvae. Whole body t hyroxine content of turbot larvae exposed to the WSF of crude oil was increased, but triiodothyronine content remained stable. Aromatic hydr ocarbon concentrations [benzene, toluene, ethylbenzene and xylene (BTE X) and naphthalenes] remained constant during flow-through tests, but 65% of the initial level of BTEX hydrocarbons and 40% of the naphthale nes were lost during static exposures. Larval mortalities increased wi th exposure to an increasing concentration of crude oil WSF. Larval ac tivity was significantly reduced even at the lowest WSF concentration. (C) 1997 The Fisheries Society of the British Isles.