Aspects of the life history of the Atlantic croaker, Micropogon undulatus




White, M.L.

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Texas A&M University.


Age 0 Micropogon undulatus occupied different estuarine habitat than older fish. Fish matured near the end of their first year of life when they were about 140-170 mm. Spawning occurred from September to March but reached a peak in October. Somatic weight-length relationships varied monthly, and changes appeared associated with maturation and spawning. Somatic weight loss was a maximum in March when it reached 24%. A validated scale method of age determination was described. Two age classes were usually observed, but only one was abundant. Mean total lengths were 155-165 mm at age I and 270-289 mm at age II. The total annual mortality rate was 96%. Contrasts are presented to illustrate differences in the life histories of croaker found north and south of Cape Hatteras, N.C.


46 p., Thesis


marine fish, Micropogon undulatus, Atlantic croaker, life history, mortality, length-weight relationships