URAFPA, Nancy-Université INRA, 54000 Nancy, France.
J Fish Biol. 2010 Jul;77(1):257-78. doi: 10.1111/j.1095-8649.2010.02689.x.
Based on the analysis of 12 egg and larval variables and temperature of 65 temperate freshwater fish species, the possible relationships between oocyte diameter, larval size at hatch, time and temperature were reassessed and the main early life-stage strategies were described and compared. Time and degree-days required to reach hatching and mixed feeding were weakly related to oocyte diameter and strongly to temperature. These results are chiefly because oocyte diameter and yolk reserves are weakly related and temperature strongly increases tissue differentiation rate, activity of hatching glands and embryo motility. Strong positive relationships were found between larval size and oocyte diameter and degree-days for incubation. No relationship was found between larval size and degree-days from hatching to mixed feeding and between degree-days for incubation and degree-days from hatching to mixed feeding. These last two results are chiefly because the developmental stages at hatching and at the onset of exogenous feeding are not fixed in ontogeny and are not directly related to either larval size or degree-days for incubation, but more probably are species specific. Whatever the spawning season, which can occur almost all year long, the different trade-offs at the early life-stages ensure that most larvae are first feeding during spring, when food size and abundance are the most appropriate.
基于对 65 种温水淡水鱼类的 12 个卵和幼虫变量以及温度的分析，重新评估了卵母细胞直径、孵化时幼虫大小、时间和温度之间的可能关系，并描述和比较了主要的早期生活阶段策略。达到孵化和混合喂养所需的时间和度日与卵母细胞直径和温度呈弱相关，与温度呈强相关。这些结果主要是因为卵母细胞直径和卵黄储备之间的关系较弱，而温度强烈地增加了组织分化率、孵化腺的活性和胚胎的活动性。发现幼虫大小与卵母细胞直径和孵化所需的度日呈强正相关。孵化到混合喂养的度日与孵化到混合喂养的度日之间没有关系，孵化所需的度日与孵化到混合喂养的度日之间也没有关系。后两个结果主要是因为孵化和外源喂养开始时的发育阶段在个体发生中不是固定的，与幼虫大小或孵化所需的度日没有直接关系，而是更可能具有物种特异性。无论产卵季节如何，几乎可以全年发生，早期生活阶段的不同权衡确保了大多数幼虫在春季开始进食，此时食物大小和丰度最适宜。
