Perch Dissection Preparation & ExaminationLocate major external anatomical parts:
Gill Covers (operculum)
Lateral line - sensory organ of fish
Remove several scales
Prepare a dry-mount of a scale.
Observe it under a microscope
What function do you think scales serve?
DissectionRemove operculum with scissors
Observe gill anatomy
Rakers - white, comb-like arches
Filaments - Red fingerlike projections
With a scalpel, remove a section of the lateral line
What function does this organ serve?
Do you notice a concentration of nerve endings?
Begin the main incision
Open the abdomen (below the gill) carefully with a scalpel
Cut with a scissors: remove a oval-shaped piece of skin (only skin) running from underneath the gills, to the anus, up to the lateral line, along the lateral line, to the gill, down to where you started the incision. Remove flap of skin (see diagram on next slide)
Main IncisionCut along the blue line...
Only cut through scales, muscles, and skin
Take special care not to cut too deep! Anterior View1. Gills
4. Pyloric caeca
5. Small intestine
7. Swim bladder ...