Effects of Shear on Eggs and Larvae of Striped Bass, Morone saxatilis, and White Perch, M. americana
作者:
RaymondP. Morgan,
RobertE. Ulanowicz,
V.James Rasin,
LindaA. Noe,
G.Brooke Gray,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1976)
卷期:
Volume 105,
issue 1
页码: 149-154
ISSN:0002-8487
年代: 1976
DOI:10.1577/1548-8659(1976)105<149:EOSOEA>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Shear stress, generated by water movement, can kill fish eggs and larvae by causing rotation or deformation. Through the use of an experimental apparatus, a series of shear (as dynes/cm 2)-mortality equations for fixed time exposures were generated for striped bass and white perch eggs and larvae. Exposure of striped bass eggs to a shear level of 350 dynes/cm2kills 36% of the eggs in 1 min; 69% in 2 min, and 88% in 4 min; exposure of larvae to 350 dynes/cm2kills 9.3% in 1 min, 30.0% in 2 min, and 68.1% in 4 min. A shear level of 350 dynes/cm2kills 38% of the white perch eggs in 1 min, 41% in 2 min, 89% in 5 min, 96% in 10 min, and 98% in 20 min. A shear level of 350 dynes/cm2applied to white perch larvae destroys 38% of the larvae in 1 min, 52% in 2 min, and 75% in 4 min. Results are experimentally used in conjunction with the determination of shear levels in the Chesapeake and Delaware Canal and ship movement for the estimation of fish egg and larval mortalities in the field.
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