Eggs and Larvae of the Logperch, Percina caprodes (Rafinesque)

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Abstract
Eggs and larvae of the logperch, P. caprodes (Rafinesque), were reared in the laboratory to recently hatched larvae. More advanced stages were collected by plankton net from Lake Erie. Developmental stages were sampled; changes in morphology and gross characteristics were described and illustrated. Manually stripped eggs were extruded as a mass, but did not remain physically attached to each other. The eggs were adhesive, demersal and amber in color with a granular yolk. Average egg diameter after water hardening was 1.12 mm. Eggs hatched 200 h after fertilization at an average water temperature of 16.5.degree. C. Average hatching length was 4.47 mm. The yolk sac was completely absorbed at 6.28 mm in most individuals. Fin ray development began at 7.80-10.00 mm with the caudal fin. The soft dorsal fin rays and anal fin rays began to develop at 12.00 mm, and all fin rays were nearly complete at 22.5 mm. Staining techniques for meristic analysis used in the present study may account for the higher number of myomeres found, compared with a previous report where staining was not used to make these counts.

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