Age and growth of king and Spanish mackerel larvae and juveniles from the Gulf of Mexico and U.S. South Atlantic Bight |
| |
Authors: | Douglas A. De Vries Churchill B. Grimes Kathy L. Lang Byron D. W. White |
| |
Affiliation: | (1) National Marine Fisheries Service, Southeast Fisheries Center, 3500 Delwood Beach Road, Panama City, FL, 32407-7499, U.S.A.;(2) Marine Resources Research Institute, South Carolina Wildlife and Marine Resources Department, P.O. Box 12559, Charleston, SC, 29412, U.S.A. |
| |
Abstract: | Synopsis Sagittal otoliths from 50 king mackerel 2.9–13.0 mm SL and 72 Spanish mackerel 2.8–22.0 mm SL collected off the southeast U.S. were examined whole at 400 × using a compound microscope-video system. Otoliths of both species had visible, presumably daily, growth increments as well as finer subdaily increments. Otolith growth was directly proportional to growth in standard length for king (r2 = 0.91) and Spanish mackerel (r2 = 0.86). Spanish mackerel were estimated to be 3–15 d old with a mean absolute growth rate (SL/number of growth increments) and 95% confidence interval of 1.15 ± 0.07 mm · d–1. The least squares linear equation: SL = –1.30 + 1.31 (age in days), with r2 = 0.67 and p < 0.001, described the relationship between length and age. There was a significant positive relationship between absolute growth rate and fish length. King mackerel were estimated to be 3–15 d old with a mean absolute growth rate of 0.89 ± 0.06 mm d–1. The least squares linear equation: SL = 0.37 + 0.82 (age in days), with r2 = 0.77 and p < 0.001, best described the relationship between length and age. The relationship between growth rate and fish length was not significant. The growth rate of king mackerel was slightly higher for fish from the Mississippi River plume than from all other locations combined, while Spanish mackerel growth rates were not significantly different. |
| |
Keywords: | Scomberomorus cavalla Scomberomorus maculatus Scombridae Daily aging Growth increments Otoliths Sagittae Mississippi River plume |
本文献已被 SpringerLink 等数据库收录! |
|