Marine - Species
SC Species Regulations for Spotted Seatrout
Saltwater Fishing License required.
Spotted Seatrout (Cynoscion nebulosus)
Dark gray above with bluish reflections. Numerous round black spots irregularly scattered on back and sides, extend to soft parts of dorsal and caudal fins. Two large canine-like teeth at tip of upper jaw, all remaining teeth small, gradually increasing in size posteriorly on lower jaw. First dorsal fin with 9 – 10 spines, second dorsal fin with one spine and 25 – 28 rays. Soft portion of dorsal fin without scales.
14 inches, 1.3 pounds;
South Carolina State Record: 11 pounds, 13 ounces (1976);
maximum age: approx. 8 – 10 years.
- Adults mature at 1 year of age. Approximate size at maturity: males – 9 inches, females – 10 inches. Spawn April – September in moderate salinity in deeper portions of estuaries.
- Spawning aggregations occur at night, often in habitat associated with piers, pilings, bridges, points of land, and holes. To attract females to aggregation sites, males generate sounds by contracting muscles to vibrate the swimbladder.
- Larvae utilize shallow tidal creeks as nurseries from June – November. Older juveniles progress to larger creeks and deeper reaches of estuaries in fall, often forming schools of similar sized fish.
- Prey on organisms located near shallow tidal creeks and marsh grass edges. Fishes constitute a greater portion of the diet as size increases.
- Adults: Large adults eat menhaden, spot, mullet, croaker, mud minnows, and occasionally grass and penaeid. Smaller adults consume larger amounts of crustaceans but also consume fishes.
- Juveniles: Feed on opossum shrimp, grass shrimp, mysid shrimps, copepods, amphipods, spot, and mud minnows. Larvae consume zooplankton (primarily copepods).
Availability/Vulnerability to Harvest
- Temperature and salinity influence distribution and abundance. In South Carolina, seatrout typically inhabit estuaries year-round, but may congregate to overwinter in deeper channels and rivers or in main estuary, possibly increasing fishing pressure. Excessive cold can result in mass mortalities. All life stages prefer moderate salinities; larvae are apparently susceptible to low salinities caused by periods of significant freshwater influx.
- Conservation concerns: degradation and loss estuarine habitat vital to all life stages; compromised water quality; influence of altered freshwater runoff on larval development; potential for significant harvest in recreational fishery.
Fischer W. 1978. FAO identification sheets for fisheries purposes: western central Atlantic (fishing area 31) volume 1 – 7. Food and Agriculture Organization of the United Nations, Rome.
Johnson DR, W Seaman Jr. 1986. Species profiles: life histories and environmental requirements of coastal fishes and invertebrates (south Florida) – spotted seatrout. U.S. Fish Wildl Serv Biol Rep 82(11.43). U.S. Army Corps of Engineers, TR EL-82-4. 18 pp.
Lassuy DR. 1983. Species profiles: life histories and environmental requirements (Gulf of Mexico) – spotted seatrout. U.S. Fish Wildl. Serv., Division of Biological Services. FWS/OBS-82/11.4. U.S Army Corps of Engineers, TR EL-82-4. 20 pp. Accessed: August, 2009.
Moore CJ. 1996. A field guide to the identification of marine species regulated in South Carolina coastal waters. Office of Fisheries Management, Marine Resources Division, South Carolina Wildlife and Marine Resources Department, Charleston, SC. 105 pp.
Moore CJ, M Barkley. 2005. South Carolina’s guide to saltwater fishes. South Carolina Department of Natural Resources, Special Publication. Columbia, SC. 132 pp.
Roumillat WA, MC Brouwer. 2004. Reproductive dynamics of female spotted seatrout (Cynoscion nebulosus) in South Carolina. Fish Bull 102: 473-487.
Saucier MH, DM Baltz, WA Roumillat. 1992. Hydrophone identification of spawning sites of spotted seatrout Cynoscion nebulosus (Osteichthys: Sciaenidae) near Charleston, South Carolina. Northeast Gulf Sci 12: 141-145.
Wenner CA, WA Roumillat, JE Moran Jr, MB Maddox, LB Daniel III, JW Smith. 1990. Investigations on the life history and population dynamics of marine recreational fishes in South Carolina: part 1. Marine Resources Research Institute, South Carolina Wildlife and Marine Resources Department, Charleston, SC. 177 pp.
Wenner C, J Archambault. 1996. Spotted seatrout: natural history and fishing techniques in South Carolina. Marine Resources Research Institute, Marine Resources Division, South Carolina Department of Natural Resources, Charleston, SC. 48 pp.