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Age and Growth of Red Drum Larvae in the North‐Central Gulf of Mexico
Author(s) -
Comyns Bruce H.,
LyczkowskiShultz Joanne,
Rakocinski Chester F.,
Steen John P.
Publication year - 1989
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1989)118<0159:aagord>2.3.co;2
Subject(s) - drum , larva , fishery , biology , geography , oceanography , ecology , archaeology , geology
Otolith growth increments were used to estimate the age of 113 larval red drum Sciaenops ocellatus collected in the north‐central Gulf of Mexico in October 1983, October 1984, and September 1985. Larval growth, as estimated by correlating age with length and dry weight measurements, was exponential and positively associated with water temperature. Mean growth in length of larvae smaller than 4 mm was relatively slow (≈0.3 mm/d), but at sizes larger than 4 mm, length increased rapidly. Based on growth equations, the mean increases in length of 4–6‐mm larvae in October 1984, October 1983, and September 1985, were 0.4, 0.5, and 0.6 mm/d, respectively. These increases in larval growth were associated with increasing water temperature at time of capture; ranges in temperature during the three periods were 24.5–25A, 25.5–26.5, and 27.8–29.0°C, respectively. Larvae that developed in October 1984 grew to a length of 6 mm in about 15.0 d, whereas in September 1985, at the warmest temperatures, larvae grew to 6 mm in only 11.7 d. Unlike those for age–length and age–weight, length–weight relationships were negatively associated with water temperature and growth rates. Therefore, larval age must be considered if length‐weight relationships are used as a measure of body condition.