Biological studies of the hogchoker, Trinectes maculatus, were conducted in the lower Hudson River, New York. Scales were formed on individuals by the time they were 10 mm total length. Annulus formation occurred between April and June, and false annuli were noted occasionally. Growth of T. maculatus was rapid during the first 2 years of life. Females grew larger and older than males, but sexual maturity occurred as early as 2 years of age for both sexes. The sex ratio was 1:1 and major spawning occurred in midsummer. The length-weight relationships of male and female hogchokers did not differ significantly and the resulting equation for 2,692 specimens was W = 0.015108 L3.10845, where W = weight (g) and L = total length (mm). Fish length at time of annulus formation was similar to that reported for Patuxent River, Maryland specimens. Size at maturity may occur earlier and spawning each year may occur over a longer period of time for hogchokers in the Hudson River compared to individuals in mid-Atlantic coastal areas.