Vitamin B1 gains in wild lake trout embryos challenge assumptions drawn from hatcheries
For decades, fisheries managers have struggled to restore recruitment in wild lake trout populations across the Great Lakes region, with limited success. Returning this species to its former abundance is hampered by overfishing, sea lamprey predation, invasive species and habitat alterations.
A new study challenges long-held assumptions about the impact of thiamine deficiency on wild lake trout embryos, suggesting that environmental thiamine acquisition may offer a promising avenue for conservation efforts. For years, fisheries managers have grappled with low recruitment rates in wild lake trout populations in the Great Lakes due to overfishing, sea lamprey predation, invasive species, and habitat changes.
Thiamine deficiency complex (TDC), caused by insufficient vitamin B1, is considered a major threat to these populations, leading to neurological abnormalities and high mortality among hatchery-reared fish. However, a groundbreaking study published in Scientific Reports by SUNY Brockport, the University of Vermont, and Oregon State University has discovered that lake trout embryos naturally incubating in Lake Champlain accumulate significant thiamine levels, a stark contrast to lab-reared embryos that showed no increase.
This discovery, led by Matthew Futia, indicates that lake trout embryos may be able to acquire enough thiamine during development to counteract the adverse effects of TDC, which has previously only been documented in hatchery studies. The research highlights the need for a reevaluation of TDC risks in wild populations, potentially leading to more effective restoration strategies and management decisions for lake trout and related species across the Great Lakes and beyond.
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