Followup email message Re: THE INFLUENCE OF HDYROLOGIC


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Posted by Kerry Grissett on January 15, 2001 at 20:25:31:

In Reply to: THE INFLUENCE OF HDYROLOGIC FACTORS ON RECRUITMENT-STOCK RELATIONS FOR CRAPPIE IN ALABAMA posted by Kerry Grissett on January 10, 2001 at 18:03:19:

Below is the body of the email reply I got from Mike Maceina regarding his abstract and research on crappie in Alabama. This is a reply to an email I sent to him for more info and a layman's explanation of the abstract and the study in general.
Thanks Mike!!!

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For a number of years, I have been involved with research to try and
determine the reproductive success of crappie in larger Alabama reservoirs.
We have examined crappie populations throughout most of the state's major
river systems including the Chattahoochee, Tallapoosa, Coosa, Tombigbee,
and the Alabama.

We found no relation between the abundance of adults and crappie offspring.
Sometimes when adult abundance is high for certain fish species,
reproductive success is low.

In our fast-flushing reservoirs along the Coosa River, Alabama, and
Tombigbee, crappie reproduction is better in years when the rivers have
average above flow during the winter (Jan-Mar) prior to spawning, the
followed by dryer post-spawn periods (April -September). In Weiss Lake,
higher water levels prior to spawning from Jan-Mar result in greater crappie
reproduction.
Similarly, in Eufaula and West Point reservoirs, higher water levels and
inflows resulted in greater production of young crappie.
In Smith and Martin reservoirs, greater production of young crappie occurred
in years when a lot of inflow occurred during April and May which is the
spawn and post-spawn time.

In Alabama reservoirs, higher water levels could potentially be used to
enhance production of young crappie. In some systems, uncontrolled climatic
conditions such as El Ninos and El Ninas events control crappie
reproduction. Unfortunately, and as you realize, we have been in a drought
and in many reservoirs the last good year for crappie reproduction was in
1996. In addition, the Water Wars going on between AL and GA have great
implications not only for crappie but for many of our other valuable fishery
resources.

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