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Cold weather and fish kills: What you need to know!

Cold weather and fish kills: What you need to know!

With the ongoing cold weather across the Panhandle, fish kills are being reported in many areas.

In the Panhandle, average water temperatures have dropped down to the 50s (degrees Fahrenheit) in many waterbodies. This is about ten degrees cooler than in normal years. Fish have a tolerance to temperature but when air and water temperatures decrease rapidly, fish kills may occur.

Recent ice coverage in Apalachicola Bay is visible example of the harsh environmental conditions that have led to reported fish kills throughout Florida including the Panhandle. Photo by L. Scott Jackson

Recent ice coverage in Apalachicola Bay is visible example of the harsh environmental conditions that have led to reported fish kills throughout Florida, including the Panhandle. Photo by L. Scott Jackson

Fish kills due to cold weather are naturally occurring phenomena. In some cases there may be an ecological benefit. Exotic fish species that have adapted to Florida’s subtropical climate may not be able to withstand these colder temperatures and large numbers of the populations may be eliminated. The decrease in the population of exotic species may allow for an increase in native populations.

The Florida Fish and Wildlife Conservation Commission’s (FWC) Fish Kill Hotline provides maps of fish kills throughout the state on a monthly basis. If you see a fish kill you can report it by phone: 1-800-636-0511 or online.

The FWC Fish Kill Website also allows the user to report fish kills and search the current database for fish kills by dates, county and possible causes of fish kills. (See example search below)

Your search was:

  • From 12/01/2013
  • To 01/24/2014
  • All Counties
  • Suspected Causes Cold Weather

Note: Select an Asterisked (*) Column Heading to Sort by That Column

*ID Report
Number
*Date
Reported
City *County Call
Category
*Probable
Cause
Water
Body Name
Specimen
Count
Comments
20048 122013 12/20/2013 Lakeland Polk Fish Kill Cold Weather N Pkwy Frontage Rd & Carabbean Rd 100s
Species Unidentified
20051 122713 12/27/2013 Treasure Island Pinellas Mortality – Mollusca Cold Weather West Gulf Blvd 100s
Conch
20057 010214 1/2/2014 North Port Sarasota Fish Kill Cold Weather El Prada West 100s
Sucker Mouth Catfish
20064 010814 1/8/2014 Tarpon Springs Pinellas Mortality – Cartilaginous Cold Weather Anclote River Boat Ramp 100s
Hammerhead Shark, Jack Crevalle, Pompano, Permit
20065 010814 1/8/2014 Panacea Wakula Fish Kill Cold Weather Lake Tucker / Alligator Point 100s
Trout, Sheepshead
20067 011014 1/10/2014 Fort Walton Beach Okaloosa Fish Kill Cold Weather Cinco Bayou 100s
Species Unidentified, Silverback, Yellow Bellie
20068 011214 1/12/2014 Palm Harbor Pinellas Fish Kill Cold Weather Anclote – Between Marker 32 & 36 Unknown Count
Unknown Count
20069 011214 1/12/2014 Tarpon Springs Pinellas Fish Kill Cold Weather Anclote – N Pointe Alexis Dr Unknown Count
Jack Crevalle, Permit
20070 011214 1/12/2014 Lecanto Citrus Fish Kill Cold Weather Creek Off Pirates Cove 10
Snook
20071 011314 1/13/2014 New Port Richey Pinellas Fish Kill Cold Weather 1/4 Mile S Anclote Key 100s
Jack Crevalle, Trout
20073 011314 1/13/2014 Crystal River Pasco Fish Kill Cold Weather East of Power Plant Unknown Count
Jack Crevalle, Pompano
20085 011814 1/18/2014 Pensacola Escambia Fish Kill Cold Weather Heron Villa Lane – Perdido Bay 100
Species Unidentified
20090 012114 1/21/2014 Pensacola Escambia Fish Kill Cold Weather Riola Lane/Perdido Bay Unknown Count
Species Unidentified

 

 

Above is an example of the December 2013 reported fish kill map: http://myfwc.com/research/saltwater/health/reported-fish-kills-abnormalities/gallery/2013-december

Above is an example of the December 2013 reported fish kill map:

There are a number of reasons for fish kills besides cold temperatures; low dissolved oxygen levels, spawning fatalities, diseases and parasites, algae blooms and human induced fish kills.

To report a fish kill to the FWC Fish Kill hotline, you will need information such as the name of the water body, whether the water is fresh, brackish or saltwater, observations of the characteristics of the water, species and number of fish that are observed (if you don’t know the species, you can check unknown), condition of the fish and if there are any abnormalities such as lesions, etc. on the fish.

If there are too many fish to count, estimate the total number by counting how many fish are in a 10’ x 10’ area, then estimate the total area that fish are present (along the shoreline and out into the water). Estimate how many 10’ x 10’ areas would fit into the total area, and multiply that number by the number of fish in the original 10’ x 10’ area. This will give you an estimate of the total number of fish.

Make a note of the weather conditions the past few days, air temperature, rainfall, cloud cover, wind strength and directions. Talk to your neighbors to determine if they have noticed anything unusual about the waterbody in the last few days.

For more information on understanding and reporting fish kills check out this publication from the University of Florida IFAS Extension:

PG

Author: Chris Verlinde – chrismv@ufl.edu

Panhandle Outdoors

Permanent link to this article: http://franklin.ifas.ufl.edu/blog/2014/01/26/cold-weather-and-fish-kills-what-you-need-to-know/