11 Signs and Symptoms of Thiamine (Vitamin B1) Deficiency
https://www.healthline.com/nutrition/thiamine-deficiency-symptoms
The Effect of B-Vitamins on a Swim-up Syndrome in Lake Ontario Lake Trout
https://www.researchgate.net/publication/248598976_The_Effect_of_B-Vitamins_on_a_Swim-up_Syndrome_in_Lake_Ontario_Lake_Trout
Vitamin B1 Deficiencies Are Plaguing Fish and Birds - The Atlantic
https://www.theatlantic.com/science/archive/2021/01/vitamin-b1-thiamine/617884/
Widespread episodic thiamine deficiency in Northern Hemisphere wildlife | Scientific Reports
https://www.nature.com/articles/srep38821