Description of some larval shortnose sturgeon (Acipenser brevirostrum) from the Holyoke Pool, Connecticut River, Massachusetts, U.S.A., and the Saint John River, New Brunswick, Canada

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Abstract
Shortnose sturgeon (Acipenser brevirostrum) protolarvae, ranging from 8.0 to 12.5 mm TL, had 20–23 postanal and 33–36 preanal myomeres and the preanal length was 66–70% of TL. The yolk sac was large, the pectoral fin buds were barely visible, and the entire body was covered with expanded melanophores. Mesolarvae of 13.0–14.7 mm TL had 22 postanal and 34 preanal myomeres, and preanal length was 61% of TL. The yoke sac was nearly gone, barbels, mouth, and pectoral fins were well developed and the anlage of the dorsal fin was visible. Mouth width of the 14.7 mm TL mesolarva was 71% of the head width and teeth were present.

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