Variation in pre-treatment count lead time and its effect on baseline estimates of cage-level sea lice abundance

R Gautam, A S Boerlage, R Vanderstichel, C W Revie, K L Hammell

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Treatment efficacy studies typically use pre-treatment sea lice abundance as the baseline. However, the pre-treatment counting window often varies from the day of treatment to several days before treatment. We assessed the effect of lead time on baseline estimates, using historical data (2010-14) from a sea lice data management programme (Fish-iTrends). Data were aggregated at the cage level for three life stages: (i) chalimus, (ii) pre-adult and adult male and (iii) adult female. Sea lice counts were log-transformed, and mean counts by lead time relative to treatment day were computed and compared separately for each life stage, using linear mixed models. There were 1,658 observations (treatment events) from 56 sites in 5 Bay Management Areas. Our study showed that lead time had a significant effect on the estimated sea lice abundance, which was moderated by season. During the late summer and autumn periods, counting on the day of treatment gave significantly higher values than other days and would be a more appropriate baseline estimate, while during spring and early summer abundance estimates were comparable among counts within 5 days of treatment. A season-based lead time window may be most appropriate when estimating baseline sea lice levels.

LanguageEnglish
Pages1297-1303
Number of pages7
JournalJournal of fish diseases
Volume39
Issue number11
Early online date24 Feb 2016
DOIs
Publication statusPublished - 30 Nov 2016

Fingerprint

Phthiraptera
Caligidae
louse
Oceans and Seas
cages
pretreatment
sea level
summer
data management
Linear Models
Fishes
autumn
effect
sea
fish

Keywords

  • abundance
  • lead time
  • pre-treatment count
  • sea lice

Cite this

Gautam, R ; Boerlage, A S ; Vanderstichel, R ; Revie, C W ; Hammell, K L. / Variation in pre-treatment count lead time and its effect on baseline estimates of cage-level sea lice abundance. In: Journal of fish diseases. 2016 ; Vol. 39, No. 11. pp. 1297-1303.
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Variation in pre-treatment count lead time and its effect on baseline estimates of cage-level sea lice abundance. / Gautam, R; Boerlage, A S; Vanderstichel, R; Revie, C W; Hammell, K L.

In: Journal of fish diseases, Vol. 39, No. 11, 30.11.2016, p. 1297-1303.

Research output: Contribution to journalArticle

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