Sampling efficiency of the Moore egg collector

North American Journal of Fisheries Management
By: , and 

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Abstract

Quantitative studies focusing on the collection of semibuoyant fish eggs, which are associated with a pelagic broadcast-spawning reproductive strategy, are often conducted to evaluate reproductive success. Many of the fishes in this reproductive guild have suffered significant reductions in range and abundance. However, the efficiency of the sampling gear used to evaluate reproduction is often unknown and renders interpretation of the data from these studies difficult. Our objective was to assess the efficiency of a modified Moore egg collector (MEC) using field and laboratory trials. Gear efficiency was assessed by releasing a known quantity of gellan beads with a specific gravity similar to that of eggs from representatives of this reproductive guild (e.g., the Arkansas River Shiner Notropis girardi) into an outdoor flume and recording recaptures. We also used field trials to determine how discharge and release location influenced gear efficiency given current methodological approaches. The flume trials indicated that gear efficiency ranged between 0.0% and 9.5% (n = 57) in a simple 1.83-m-wide channel and was positively related to discharge. Efficiency in the field trials was lower, ranging between 0.0% and 3.6%, and was negatively related to bead release distance from the MEC and discharge. The flume trials indicated that the gellan beads were not distributed uniformly across the channel, although aggregation was reduced at higher discharges. This clustering of passively drifting particles should be considered when selecting placement sites for an MEC; further, the use of multiple devices may be warranted in channels with multiple areas of concentrated flow.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Sampling efficiency of the Moore egg collector
Series title North American Journal of Fisheries Management
DOI 10.1080/02755947.2012.741557
Volume 33
Issue 1
Year Published 2013
Language English
Publisher American Fisheries Society
Publisher location Lawrence, KS
Contributing office(s) Coop Res Unit Atlanta
Description 10 p.
First page 79
Last page 88
Online Only (Y/N) N
Additional Online Files (Y/N) N