FISHERIES
Southwest Region

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Spawning

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frame example Razorback suckers, 3 weeks old Colorado pikeminnow fry, 1 day old Razorback sucker eggs, 1 hour old Silvery minnow egg larva

Traditionally, the spawning season at the Dexter National Fish Hatchery & Tecnology Center (Center) kicks-off in March and ends in mid-June. The techniques the Center employs are induced spawning and natural spawning. Seventeen different species on the endangered and threatened list are spawned at the Center.

Broodfish from these species are purposely reared at the Center for spawning. Each year the Center will spawn over 350 pairs of the broodfish using the induced spawning method. These pairs will produce over 3.5 million eggs. This count does not include those that will spawn naturally in the earthen ponds. Fish from each spawn will be taken and held at the station for future broodstock, ensuring genetic diversity. Different pairs of each species are spawned each year, discouraging spawning of the same fish year after year.

The success the Center has experienced in spawning is evident in its distribution of the species into their natural habitat. Without this type of intervention the chances of these species being extinct would almost be certain.

 

 
spawning Injecting female with hormones prior to spawning removing eggs from a Razorback sucker Stirring eggs and males milt with a feather Eggs placed in baskets to harden
 

Last updated: July 31, 2007

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