Florida wildlife officials say 76 manatees have died from boat strikes this year, the highest number in five years. But alves dying within a year of birth — remain the leading cause, with 107 recorded so far. Overall, 509 manatees have died in 2025, fewer than the five-year average, but more than last year. Biologists say the spike in young deaths may signal lingering malnutrition or possibly a rebound in manatee reproduction.