Nutritional deficiency associated with reduced thiamine (vitamin B1) and reduced natural reproduction of salmonid species in the Great Lake Region is well established. The negative relationship between egg thiamine and lipid concentration to post-hatch larval growth and survival in teleost species, coupled with the limited research of egg thiamine in Acipenseriform species of conservation concern, including lake sturgeon, indicates that study of thiamine concentrations lake sturgeon eggs is warranted. Eggs were collected from females (N = 12) during the early and late portion of the spawning run in 2007 in a wild population from Black Lake, MI. Concentrations of thiamine, lipid and fatty acid concentration were measured along with female biological information (body size and egg size) and characteristics of larvae at hatch. Significant differences in egg thiamine concentrations were observed between early- and late-spawning females (mean ± SD: 2.36 nmol·g⁻¹ ± 1.09 vs. 0.73 ± 0.25 nmol·g⁻¹, W = 0.05, p < .01). No significant relationships were observed between female body size or egg size and egg lipid or thiamine concentration. Differences in lipid and thiamine concentrations were not predictive of larval body size or yolk sac volume at hatch. Total and phosphorylated thiamine were correlated with n-3 polyunsaturated fatty acids, suggesting that dietary items were likely partially responsible for provisioning of essential compounds. Given the negative effects of low egg thiamine concentration on larval survival in other fish species globally, results indicate that further research in areas of nutrient acquisition and thiamine effects on larval survival, natural recruitment, and hatchery feeding strategies is warranted for lake sturgeon.

中文翻译：

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卵脂和硫胺素在早产和晚产湖鲟之间有所不同

在大湖区，与硫胺素（维生素 B1）减少和鲑鱼物种自然繁殖减少相关的营养缺乏是公认的。卵硫胺素和脂质浓度与硬骨鱼物种的孵化后幼虫生长和存活之间存在负相关关系，再加上对包括湖鲟在内的受保护的鲟鱼种类中卵硫胺素的研究有限，表明对湖鲟卵硫胺素浓度的研究是保证。从雌性（N = 12) 在 2007 年产卵运行的早期和晚期，来自密歇根州黑湖的野生种群。测量硫胺素浓度、脂质和脂肪酸浓度以及雌性生物信息（体型和卵大小）和孵化时幼虫的特征。在早产和晚产雌性之间观察到卵硫胺素浓度的显着差异（平均值± 标准差：2.36 nmol·g ^-1  ± 1.09 vs. 0.73 ± 0.25 nmol·g ^-1 , W  = 0.05, p < .01)。在雌性体型或鸡蛋大小与鸡蛋脂质或硫胺素浓度之间没有观察到显着关系。脂质和硫胺素浓度的差异不能预测孵化时的幼虫体型或卵黄囊体积。总硫胺素和磷酸化硫胺素与 n-3 多不饱和脂肪酸相关，这表明饮食项目可能是提供必需化合物的部分原因。鉴于卵硫胺素浓度低对全球其他鱼类幼体存活的负面影响，结果表明，有必要对湖鲟在营养获取和硫胺素对幼体存活、自然补充和孵化饲养策略的影响方面进行进一步研究。