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The Effect of Thermal Overwintering Conditions of Spawners on Duration of Egg Incubation and Holding of Yolk Sac Larva in Sturgeons
Russian Agricultural Sciences Pub Date : 2021-04-12 , DOI: 10.3103/s1068367421010055
E. V. Bubunets , A. V. Zhigin , A. V. Labenets

Abstract—

The goal of this research is to determine temperature threshold limits and duration of overwintering in spawners of beluga (great sturgeon) and Russian sturgeon in the aquaculture farms that would preclude impairment of the generative function. The study performs the assessment of temperature conditions and outcome of overwintering of spawners, egg incubation, and holding of yolk sac larva in beluga and Russian sturgeon in the farms using the warm discharge water from power-producing facilities. The examined parameters have been compared with data obtained from spawners from natural populations in the lower reaches of the Volga River. It has been established that spawners of studied species can survive up to 9 months under conditions of food deprivation at a mean water temperature of 2.2–2.4°С. Both studied species have exhibited an increase in duration of incubation to 24 h and longer compared with individuals from natural populations under conditions of shortened and “comfortable” warm-water overwintering. The duration of egg incubation and holding of yolk sac larva nearest to the conditional norm has been obtained under more severe overwintering conditions of spawners. Desirable conditions include mean water temperature of 3°С and duration of 3–6 months for overwintering of beluga spawners and gradual increase in water temperature from 11 to 14°С and holding of yolk sac larva from 14 to 18°С for the egg incubation. Preferable conditions for overwintering of spawners of Russian sturgeon are mean water temperature of 4°С and duration of 4.5–6.5 months. Preferable conditions for egg incubation of the latter are gradual increase in water temperature from 13 to 16°С and holding of yolk sac larva from 16 to 20°С.



中文翻译:

虾的热越冬条件对St鱼卵孵化和卵黄囊幼虫持留时间的影响。

摘要-

这项研究的目的是确定水产养殖场中白lu(大st鱼)和俄罗斯st鱼产卵的温度阈值极限和越冬持续时间,以防止其生殖功能受到损害。该研究使用发电设备的温热排放水评估温度条件和产卵场越冬,卵孵化以及养殖白鹭和俄罗斯st鱼卵黄囊幼虫的情况。已将检查的参数与从伏尔加河下游自然种群的产卵场获得的数据进行了比较。已经确定,在平均水温为2.2–2.4°С的食物匮乏的条件下,所研究物种的产卵者可以存活长达9个月。与来自自然种群的个体相比,在缩短且“舒适”的温水越冬条件下,两个研究物种均显示出其孵化时间延长至24小时,并且更长。在更严重的越冬越冬条件下,可以获得卵孵化的持续时间和最接近条件准则的卵黄囊幼虫的保持时间。理想的条件包括平均水温为3°С,持续时间为3–6个月,以使白鲸产卵越冬,并将水温从11逐渐升高到14°С,卵黄幼虫从14升高到18°С进行卵孵化。 。俄罗斯st鱼产卵场越冬的首选条件是平均水温为4°С,持续时间为4.5-6.5个月。

更新日期:2021-04-13
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