Insulin-like growth factor-I and environmental modulation of growth during smoltification of spring chinook salmon (Oncorhynchus tshawytscha)

被引:147
作者
Beckman, BR
Larsen, DA
Moriyama, S
Lee-Pawlak, B
Dickhoff, WW
机构
[1] NOAA, Natl Marine Fisheries Serv, NW Fisheries Sci Ctr, Integrat Fis Biol Program, Seattle, WA 98112 USA
[2] Univ Washington, Sch Fisheries, Seattle, WA 98195 USA
关键词
D O I
10.1006/gcen.1997.7036
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The relations among rearing environment, fish size, insulin-like growth factor-1, and smoltification were examined in yearling spring chinook salmon (Oncorhynchus tshawytscha). Juvenile chinook salmon were size-graded into small and large categories. Half of the fish in each group were reared at an increased temperature and feeding rate beginning in mid-February, resulting in four distinct treatment groups: large warm-water (LW), large cool-water (LC), small warm-water (SW), and small cool-water (SC). Increased temperature and feeding rate resulted in overall higher growth rates for the LW and SW groups. Temporal increases in insulin-like growth factor-I (IGF-I) were found in all groups through the spring. Plasma IGF-I levels were significantly higher in warm-water groups than in cool-water groups from late March through May. Size itself appeared to have little relation to plasma IGF-I levels. Simple regression showed a significant relation between plasma IGF-I and growth (P < 0.001, R-2 = 0.50). No differences were found between treatment groups in other physiological parameters assessed (plasma thyroxine, gill Na+-K+-ATPase, liver glycogen, body lipid).
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页码:325 / 335
页数:11
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