Estuarine recruitment, growth, and first year survival of age-0 juvenile red drum (Sciaenops ocellatus) in North Carolina. Transactions of the American Fisheries Society 137:1089–1103
Abstract.—For many marine and estuarine fishes, there is growing evidence that processes occurring during the juvenile life stage can contribute to determining the relative success of recruitment of annual cohorts into the fishery. We studied two consecutive annual cohorts of juvenile red drum Sciae...
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| Format: | Text |
| Language: | English |
| Published: |
2008
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.588.2691 http://people.uncw.edu/scharff/publications/2008 TAFS (Stewart and Scharf).pdf |
| Summary: | Abstract.—For many marine and estuarine fishes, there is growing evidence that processes occurring during the juvenile life stage can contribute to determining the relative success of recruitment of annual cohorts into the fishery. We studied two consecutive annual cohorts of juvenile red drum Sciaenops ocellatus from estuarine arrival through age 1 in two estuarine systems of southeastern North Carolina. For age-0 cohorts, relative abundance generally peaked in mid to late fall, and fish were present in shallow-water habitats through December before presumably moving to deeper waters during winter. Reappearance of red drum in shallow-water habitats during spring occurred between late March and late April depending on spring warming rates. Considerable differences in relative abundance of age-0 red drum were observed between estuaries; such differences may be related to variations in estuarine hydrology and flushing rates, which probably affect larval delivery and distribution. Otolith-derived hatch date distributions indicated that red drum juveniles in North Carolina were produced between July and October; interannual differences (of up to 30 d) in peak spawning times were correlated with variable nearshore water temperatures during summer. Juvenile growth rates during fall ranged from 0.45 to 0.75 mm/d, and mortality rates were between 1.6 % and 4.1 % per day; ratios of weight-specific instantaneous growth to instantaneous mortality were greater than 1.0 for all cohorts during their first fall. Both growth and mortality varied between estuaries and years, suggesting |
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