The influence of salinity on the cytology of interrenal (cortisol producing) cells of the sea bass was studied transferring immature specimens from 3.6% sea water to brackish water (1.2% and 1.8%) for different periods (up to 8 days). The handling stress was also evaluated, considering the fish transferred for 8 days in 3.6% sea water as general controls. The interrenal cells display two main aspects: I) nucleus rounded, euchromatic with prominent nucleolus, II) nucleus with irregular outline and condensed chromatin. The mean nuclear diameter in type II cells is significantly smaller than in type I cells. The type I, considered as active cells, account for near 45% of the total in controls. At TEM analysis, the two cell types could be distinguished by nuclear, mitochondrial and SER cytology. In experimental fish, no variations occurred of mean cell diameter of I and II types. Otherwise, their relative abundance changed. The results confirmed that sea bass interrenals easily tolerate fluctuations of salinity.
Fine cytology of interrenal cells in sea bass Dicentrarchus labrax (L.): influence of different salinity concentrations.
ABELLI, Luigi;
1997
Abstract
The influence of salinity on the cytology of interrenal (cortisol producing) cells of the sea bass was studied transferring immature specimens from 3.6% sea water to brackish water (1.2% and 1.8%) for different periods (up to 8 days). The handling stress was also evaluated, considering the fish transferred for 8 days in 3.6% sea water as general controls. The interrenal cells display two main aspects: I) nucleus rounded, euchromatic with prominent nucleolus, II) nucleus with irregular outline and condensed chromatin. The mean nuclear diameter in type II cells is significantly smaller than in type I cells. The type I, considered as active cells, account for near 45% of the total in controls. At TEM analysis, the two cell types could be distinguished by nuclear, mitochondrial and SER cytology. In experimental fish, no variations occurred of mean cell diameter of I and II types. Otherwise, their relative abundance changed. The results confirmed that sea bass interrenals easily tolerate fluctuations of salinity.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
