This study examined growth of unfished juvenile Northern cod (Gadus morhua) off Newfoundland concomitant with stock collapse in the cold early 1990s. Two unpublished data sets were examined, one from collapse‐period trapping sites along the northeast coast of Newfoundland and one from a post‐collapse inshore trawl survey. Cumulative surface and bottom temperatures were significant predictors of growth rates of the young fish with year‐classes born during collapse experiencing slower growth than those born during subsequent warming. Relationships between accrued temperature and growth were consistent across periods, with slow growth of collapse‐period fish reflecting slower accumulation of temperature‐at‐age. Temperature influences were spatially broad‐based with no significant differences in growth rates for fish captured along the entire northeast coast of Newfoundland. Predicted differences in growth rates for collapse versus recovery year‐classes were proportional to cumulative surface temperatures but not cumulative bottom temperatures. Although significant, temperature effects on growth were relatively unimportant at youngest ages. Overall, growth differences between periods were small but large differences occurred between slowest and fastest growing year‐classes. The results suggest initial responses to increasing temperatures were delayed following collapse. We conclude that although temperature was an important determinant of dampened productivity that it alone cannot account for the collapse and slow recovery of the stock. This is the first known study to directly quantitatively link temperature impacts to an unfished component of the Northern cod stock complex during collapse, removing need for implicit assumptions about whether or not cold conditions contributed to the collapse of this iconic fish stock.

中文翻译：

---

种群崩溃期间温度对未捕捞的北部北鳕（Gadus morhua）生长的影响

这项研究研究了未捕捞的北鳕鱼（Gadus morhua）的生长），在1990年代初的寒冷时期，伴随着股票下跌，纽芬兰离开了该地区。检查了两个未公开的数据集，一个来自纽芬兰东北海岸的坍塌期捕获点，另一个来自崩溃后的近海拖网调查。累积的表面温度和底部温度是衰落期间出生的年级幼鱼生长速度比随后变暖期间生长的幼鱼的重要预测指标。在各个时期，应积温度与生长之间的关系是一致的，坍塌期鱼类的缓慢生长反映了适龄温度下的缓慢积累。温度影响在空间上是广泛的，在纽芬兰整个东北海岸捕获的鱼的增长率没有显着差异。崩溃年级与恢复年级的预测增长率差异与累积表面温度成正比，而不与累积底部温度成正比。尽管影响很大，但温度对生长的影响在最年轻的年龄相对不重要。总体而言，不同时期之间的增长差异很小，但增长最快和最快的年级之间差异很大。结果表明，坍塌后，对温度升高的初始响应被延迟了。我们得出的结论是，尽管温度是生产力下降的重要决定因素，但温度本身不能解决库存下降和库存恢复缓慢的问题。这是第一个将倒塌过程中温度影响与北部鳕鱼种群中未捕捞成分直接定量联系的已知研究，