Costa Rica Fish ID Help

<p>Guys,</p> <p>I recently returned from Costa Rica where I had a chance to catch a few cichilds. Unfortunately, I have not been able to find a key to separate the species of <em>Parachromis</em>. I have read Moose&#39;s adventures and have tried to use his photos to get started. I beleive I have <em>P. dovii, P. loisellei, and P. managuensis</em>. I would appreciate it if someone could direct me to a key or can tell me what the distinguishing features are that separate these species.&nbsp;</p> <p>I caught the fish in the Rio San Carlos drainage very near Nicaragua.&nbsp;</p> <p>Thanks!</p> <p>Brian</p> <p>&nbsp;</p> <p>&nbsp;</p>