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Sampling effort required to obtain repeatable average size estimates of juvenile fish

Moran, Damian LU (2011) In Aquatic Biology 11(3). p.239-242
Abstract
Larval and juvenile fish cohorts often have skewed size distributions due to inter-individual variation in growth rates. A resampling analysis was used to investigate how much sampling effort is required to achieve repeatable average size estimates in populations of juvenile yellowtail kingfish Seriola lalandi Valenciennes. One hundred juveniles (30 d post-hatch) were measured for total length and wet weight from 9 cohorts reared in captivity. From an analysis of cohort size distribution the mean was determined to be a suitable measure of the average for length, while the median was best for weight. One thousand resamples of mean length and median weight were performed for each cohort data set, with sample sizes ranging from 2 to 100... (More)
Larval and juvenile fish cohorts often have skewed size distributions due to inter-individual variation in growth rates. A resampling analysis was used to investigate how much sampling effort is required to achieve repeatable average size estimates in populations of juvenile yellowtail kingfish Seriola lalandi Valenciennes. One hundred juveniles (30 d post-hatch) were measured for total length and wet weight from 9 cohorts reared in captivity. From an analysis of cohort size distribution the mean was determined to be a suitable measure of the average for length, while the median was best for weight. One thousand resamples of mean length and median weight were performed for each cohort data set, with sample sizes ranging from 2 to 100 individuals. The point at which increasing sample size resulted in only a negligible increase in precision (variance between resamples <0.1%) corresponded to n = 19 for mean length and n = 30 for median weight. Since yellowtail kingfish display a magnitude of size heterogeneity similar to other marine species with small pelagic larvae reared in captivity, the sample sizes determined in the present study can act as a general guideline for larval fish studies. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sampling effort, Sample size, Size heterogeneity
in
Aquatic Biology
volume
11
issue
3
pages
239 - 242
publisher
Inter-Research
external identifiers
  • wos:000287668300005
  • scopus:79952354281
ISSN
1864-7782
DOI
10.3354/ab00316
language
English
LU publication?
yes
id
aaecaa1f-1055-418a-a416-fa5c5e89d4e7 (old id 1876475)
date added to LUP
2011-04-18 10:30:36
date last changed
2017-01-01 03:20:20
@article{aaecaa1f-1055-418a-a416-fa5c5e89d4e7,
  abstract     = {Larval and juvenile fish cohorts often have skewed size distributions due to inter-individual variation in growth rates. A resampling analysis was used to investigate how much sampling effort is required to achieve repeatable average size estimates in populations of juvenile yellowtail kingfish Seriola lalandi Valenciennes. One hundred juveniles (30 d post-hatch) were measured for total length and wet weight from 9 cohorts reared in captivity. From an analysis of cohort size distribution the mean was determined to be a suitable measure of the average for length, while the median was best for weight. One thousand resamples of mean length and median weight were performed for each cohort data set, with sample sizes ranging from 2 to 100 individuals. The point at which increasing sample size resulted in only a negligible increase in precision (variance between resamples &lt;0.1%) corresponded to n = 19 for mean length and n = 30 for median weight. Since yellowtail kingfish display a magnitude of size heterogeneity similar to other marine species with small pelagic larvae reared in captivity, the sample sizes determined in the present study can act as a general guideline for larval fish studies.},
  author       = {Moran, Damian},
  issn         = {1864-7782},
  keyword      = {Sampling effort,Sample size,Size heterogeneity},
  language     = {eng},
  number       = {3},
  pages        = {239--242},
  publisher    = {Inter-Research},
  series       = {Aquatic Biology},
  title        = {Sampling effort required to obtain repeatable average size estimates of juvenile fish},
  url          = {http://dx.doi.org/10.3354/ab00316},
  volume       = {11},
  year         = {2011},
}