EBIO lab - chiclids

EBIO lab - chiclids - Cichlid Behavior Luke Morin EBIO A...

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Luke Morin EBIO – A Human Approach Lab 11/7/07 Cichlid Behavior  Introduction –  For this lab, we are investigating what factors influence the level  of aggression between 2 cichlid fish when an “intruder” fish is placed in a tank  with a “resident” fish who has established that space as its territory. Possible  influencing factors could include specimen size, specimen sex or territoriality.  Because larger size is naturally advantageous in nature and often a biological  factor that determines dominance, it would be logical that in a neutral  environment, larger fish would be dominant and display more aggressive  behavioral patterns. Since a favorable territory is in the best interest of all  Cichlids to thrive, it would logically follow that dominant fish would display  aggression in an effort to gain control of favorable territory. Therefore, we  hypothesized that larger fish would display more aggressive behavior than  smaller fish in a intruder/resident model, regardless of residency or sex. Methods –  We completed our data collection in several steps. First, we took  male and female fish of varying sizes and individually placed them in tanks for a  period of several days to allow them to establish their tanks as territory. These  fish were denoted as residents. We also had a separate community tank of fish 
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to be denoted as intruders. We then moved an intruder (taking care to use a 
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This note was uploaded on 04/03/2008 for the course EBIO 1050 taught by Professor Basey,john during the Fall '08 term at Colorado.

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EBIO lab - chiclids - Cichlid Behavior Luke Morin EBIO A...

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