MIAMI (CBSMiami/AP) — It’s manatee season across Florida, a time when boaters are supposed to slow down for the gentle sea giants, but some folks just aren’t following the rules which led to deadly results.

Florida boaters broke a record this year, killing more manatees in 2019 than in past years, according to wildlife officials.

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Boaters hit and killed 129 manatees so far this year. That tops the previous record of 125 deaths last year. The five year average was 95 boat-related manatee deaths, according to preliminary data from the Florida Fish and Wildlife Conservation Commission.

The leading cause of death last year for manatees was natural causes, which killed 230.

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The Daytona Beach News-Journal reports 53 manatees died from cold weather this year.

Boating advocates have pushed back against go-slow speed zones, arguing the reason more are dying may be because there isn’t enough seagrass to feed them.

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(© Copyright 2020 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)