A New Device for Collecting Drifting Semibuoyant Fish Eggs

Altenbach, Christopher S.; Dudley, Robert; Platania, Steven P.

doi:10.1577/1548-8659(2000)129<0296:andfcd>2.0.co;2

Cited by 19 publications

(20 citation statements)

References 3 publications

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“…The MEC provides a more effective method for the nondestructive capture of semibuoyant fish eggs than seines or drift nets (see Altenbach et al 2000); however, an understanding of efficiency and the relationship between captures, discharge, and release point is important to an accurate assessment of the reproductive success of endangered pelagic broadcast-spawning cyprinids. Experiments in both a controlled setting (flume trials) and field tests were affected by discharge and velocity, although the direction of this relationship was different between the experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Gear efficiency: flume trials.-We tested the efficiency of the MEC (Figure 1), a sluice box-like gear designed for the nondestructive capture of semibuoyant fish eggs (Altenbach et al 2000), under five discharge scenarios (0.14, 0.28, 0.71, 1.42, and 2.12 m 3 /s). The MEC was mounted in the center of the flume 28 m from the upstream end of the channel.…”

Section: Methodsmentioning

confidence: 99%

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Sampling Efficiency of the Moore Egg Collector

Worthington¹,

Brewer²,

Grabowski³

et al. 2013

N American J Fish Manag

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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.Received August 8, 2012; accepted October 12, 2012

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Sampling Efficiency of the Moore Egg Collector

Worthington¹,

Brewer²,

Grabowski³

et al. 2013

N American J Fish Manag

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“…Prior to and following the release, two smaller spawning events were associated with rainstorms. Eggs were obtained eggs using modified Moore egg collectors (Altenbach et al 2000). We sub-sampled a total of 450 eggs from the collection (approximately 40 eggs from 10, 1-h time blocks during three distinct bouts of spawning; Table 1, Figure 2.…”

Section: Sampling For Genetic Analysismentioning

confidence: 99%

Genetic heterogeneity among pelagic egg samples and variance in reproductive success in an endangered freshwater fish, Hybognathus amarus (Cyprinidae)

2005

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SynopsisA sweepstakes-mismatch process whereby reproduction is poorly coordinated with appropriate resources for larval development and recruitment can result in large variance in reproductive success among individuals and spawning aggregations. This process has been proposed to explain low ratio of genetic effective population size (N e ) to adult census size (N) ratios in marine species with high fecundity, pelagic spawning, and extensive mortality in early life stages. This process is also hypothesized to also account for very low N e /N ([ 0.001) observed in the federally endangered Rio Grande silvery minnow, Hybognathus amarus. This species is a freshwater fish that shares life-history features with marine pelagic spawners. We tested two key predictions of the sweepstakes-mismatch hypothesis using molecular data: (i) that temporally distinct samples of eggs differ in genetic composition and, (ii) that egg samples do not comprise a random subset of potential adult breeders. We present genetic data that supports both predictions and that are consistent with the hypothesis that high variance in reproductive success among adult breeders is an important factor that lowers N e /N in H. amarus. This study highlights the importance of understanding the interaction of early life history and fragmentation in devising conservation plans for endangered aquatic organisms.

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“…Use of drift nets to sample beads: The comment states that drift nets are 4.73 times less efficient than Moore egg collectors at capturing beads (Altenbach et al 2000). Examination of their methods shows that while flow through Moore egg collectors was well maintained, drift nets were left to clog with debris.…”

Section: Criticisms Of Field Methodologymentioning

confidence: 99%

“…Examination of their methods shows that while flow through Moore egg collectors was well maintained, drift nets were left to clog with debris. Altenbach et al (2000) state: "A potential explanation for the differences in catch rate between devices was that the natural hydrologic path followed by drifting fish eggs approaching the drift net was altered because the device accumulated debris." Medley et al (2007) took considerable effort to ensure that debris did not clog drift nets.…”

Section: Criticisms Of Field Methodologymentioning

confidence: 99%