Abstract
Abstract We describe the development of gill filaments and secondary lamellae of larval walleyes Stizostedion vitreum from hatching to 21 d posthatch. The number of gill filaments was counted on the second gill arch of 20 fish at 7, 14, and 21 d posthatch and on the gill arch of 5 fish on all other days. The length of gill filaments and number of secondary lamellae per gill filament were determined for the first, third, fifth, and seventh gill filaments on the most ventral part of the gill arch. Gill filaments were first observed at 3 d posthatch (47 temperature units, TU, °C), and the first secondary lamellae were observed at 10 d posthatch (163 TU). Results indicated strong positive relationships between cumulative temperature units posthatch and number of gill filaments, length of gill filaments, and number of secondary lamellae per gill filament. There were strong positive relationships between total length of the fish and number of gill filaments, between total length of the fish and length of gill f...
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