Larval and early juvenile little tunny, Euthynnus alletteratus, were collected from the northern Gulf of Mexico (434 fish the Mississippi River delta region and 150 off Panama City, Florida) using a 1 × 2 m, 0.947-mm mesh neuton net and a 1 × 1 m, 0.333-mm mesh Tucker
trawl. Sagittae were removed from 200 fish collected from the Mississippi River delta region and 150 collected from off Panama City, Florida, and examined whole at 800X magnification. Daily growth increments were visible in the sagittae of little tunny (2.5—14.0 mm SL) which ranged in
age from 2 to 13 d. Growth estimated as the slope of a regression of SL on age, was rapid (1.07 mm d−1). Fish collected off Panama City grew faster than those collected in the vicinity of the Mississippi River discharge plume. Instantaneous daily mortality rates, estimated
from survivorship curves were higher in the Mississippi River plume fish (0.95) than those from Panama City, Florida (0.72).
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