Age and Growth of Red Drum Larvae in the North-Central Gulf of Mexico
作者:
BruceH. Comyns,
Joanne Lyczkowski-Shultz,
ChesterF. Rakocinski,
JohnP. Steen,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1989)
卷期:
Volume 118,
issue 2
页码: 159-167
ISSN:0002-8487
年代: 1989
DOI:10.1577/1548-8659(1989)118<0159:AAGORD>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Otolith growth increments were used to estimate the age of 113 larval red drumSciaenops ocellatuscollected 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.
点击下载:
PDF (781KB)
返 回