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A new method to measure the terminal velocity of small particles: A demonstration using ascending eggs of the Atlantic menhaden (Brevoortia tyrannus)
Author(s) -
Cambalik John J.,
Checkley David M.,
Kamykowski Daniel
Publication year - 1998
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1998.43.7.1722
Subject(s) - menhaden , salinity , population , measure (data warehouse) , environmental science , fishery , replicate , biology , oceanography , geology , statistics , fish <actinopterygii> , mathematics , computer science , demography , database , sociology , fish meal
A new method, incorporating video, motion analysis, and a novel experimental apparatus, was used to measure the terminal velocity of particles. The method facilitated the investigation of treatment effects and maximized the number of measurements For each replicate, thus improving the statistics for a population of particles. The eggs of the Atlantic menhaden ( Brevoortia tyrannus ) were used to demonstrate the method by investigating the effects of salinity and stage of development on their ascent rate. Egg ascent rate was greatest at intermediate salinity (36.5‰) and decreased in the late stage of embryonic development. We estimate eggs at oceanic salinities (>35.5‰) in nature to ascend at 0.19–0.25 cm s −1 .