Keep a meal (usually) and release the rest if I stay. Female Perch with eggs always go back as do the monster 'gills and crappies. Fish small(ish), heavily hit waters and choose to protect the gene pool. Catch a lot of flak for sending nice fish back down the hole, the locals may or may not get over it. My choice, if they could "learn" to catch then keep them, no problem but most seem to have brain lock on technique/approach.