Improvement of fish length estimates for underwater visual census of reef fish biomass

Autor:
Yulianto, I.; Hammer, C.; Wiryawan, B.; Pardede, S.T.; Kartawijaya, T.; Palm, H.W.
In:

Journal of Applied Ichthyology

ISBN: 0175–8659
DOI: 10.1111/jai.12672
Seite: 1 - 7
Jahr: 2015

Einordung:
Institut: Professur Aquakultur und Sea-Ranching

Abstract:
Accuracy and precision are of great importance in the assessment
of reef fish biomass when conducting an underwater
visual census (UVC). Quantification and subsequent correction
of the bias is required in order to standardize the estimates
and correct for underwater distortion. To optimize the
UVC, the observer should receive length-measurement training
in order to obtain in situ-measurements that are as accurate
and precise as possible. The objective of this study was
to quantify the bias of fish length measurements made by
divers with and without training in order to enhance reef fish
biomass estimates. Adaptation of the diver to estimate fish
lengths was analysed as a part of reef fish biomass monitoring
in the Karimunjawa National Park, a national marine
sanctuary in the Java Sea, Indonesia. Two divers practiced
estimating a variety of fish in a natural environment by using
styrofoam models attached to strings and sinkers. Analyses
showed that by training the diver, his/her accuracy and precision
improved substantially. Proving its reliability, an underwater
visual census (UVC) becomes a useful and reliable
method to assess the biomass of reef fishes.

Ansprechpartner

 

 

Zur Publikation: Mitarbeiter, Projekte
Weitere Publikationen im Forschungsteilschwerpunkt

 

 

 

 

Letzte Änderung des Eintrages: 10.02.2017

Suche :
Datenbanksuche Publikation (in Titel, Autor, Beschreibung)