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Body Deformities

The occurrence of odd shaped-fish can have many causes. It is normal to occasionally discover deformed individuals in any fish population. A physical injury or drastic change in water temperature (usually an increase) when the fish is in the egg stage can produce fish with characteristic “stumpy” or “truncate” appearance. These same conditions can cause scoliosis, which is easily recognized because the fish has a distinct curve in its spine.

 

 

 

 

An example of a lake whitefish with a stunted or 'truncate' body.
Source: DFO 1999
( click to enlarge )


An example of a longnose sucker with scoliosis.
Source: Hatfield Consultants 2008
( click to enlarge )

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