Variability in performance in wild Atlantic salmon, Salmo salar L., fry from a single redd

被引:32
作者
De Leániz, CG
Fraser, N
Huntingford, FA
机构
[1] Univ Glasgow, Inst Biomed & Life Sci, Div Environm & Evolutionary Biol, Fish Biol Grp, Glasgow G12 8QQ, Lanark, Scotland
[2] Ctr Ictiol Arredondo, Gobierno Cantabria, Direcc Reg Montes & Concervac Nat, Arredondo 39813, Cantabria, Spain
关键词
dispersal; growth; salmon; variability;
D O I
10.1046/j.1365-2400.2000.00223.x
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Dispersal and growth were studied in Atlantic salmon, Salmo salar L., fry from a natural isolated redd. The distribution of fry leaving the redd was strongly peaked, 80% being caught within a 2-week period. Early in the dispersal period, ail fry leaving the rt dd had remnants of yolk sac and had not fed; by half way through the dispersal period, no fry had any visible yolk, but 35% still had empty stomachs. Fry leaving the redd during the first half of the dispersal period tended to settle in different first feeding sites than those dispersing later. Predation on fry by larger salmonids was frequent, especially during dispersal. Coefficients of variation for length, weight and condition factor increased significantly over the study period and for individually recognised fry, growth rates varied markedly. Thus, individual salmon fry differ in physical status on emergence from the redd and these differences are amplified during the first few weeks after emergence.
引用
收藏
页码:489 / 502
页数:14
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