A strategy for developing scientific sampling tools for fishery-independent surveys of estuarine fish in New South Wales, Australia

Rotherham, Douglas; Underwood, A. J.; Chapman, M. G.; Gray, Charles A.

doi:10.1093/icesjms/fsm096

Cited by 70 publications

(59 citation statements)

References 17 publications

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“…An important consideration in designing any robust ecological study is the choice of sampling method (Thomas 1996, Rotherham et al 2007). Different sampling methods may result in different estimates of a population's mean and variance (Andrew & Mapstone 1987).…”

Section: Introductionmentioning

confidence: 99%

Cost-efficient sampling of fish assemblages: comparison of baited video stations and diver video transects

Langlois

Harvey²,

Fitzpatrick³

et al. 2010

Aquat. Biol.

239

156

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Baited remote underwater stereo-video (stereo-BRUV) stations and diver operated stereo-video (stereo-DOV) transects are increasingly used to sample both tropical and temperate fish assemblages. Compared to in situ visual census methods, the use of stereo-video reduces interobserver variability, improves definition of the sample unit area, increases accuracy of fish length estimates and provides a permanent record of the assemblage that can be validated where required or independently reanalysed. Previous studies have suggested that stereo-BRUV collects representative data on both carnivorous and herbivorous species and can be more cost-efficient than diverbased survey methods. This study compares estimates of common fish assemblage metrics obtained with stereo-BRUV stations and stereo-DOV transects across 3 biogeographic regions, and uses a costoptimization procedure to compare the efficiency of these 2 methods. Stereo-BRUV stations were found to sample greater species richness and obtain greater estimates of relative biomass of generalist carnivores, but no differences occurred in the biomass of herbivores sampled by the 2 techniques. Stereo-BRUV stations generally obtained estimates of assemblage metrics with less variance, resulting in greater power to detect spatial and temporal changes in the fish assemblage metrics. Cost -benefit analyses found that stereo-BRUV was generally more time efficient than stereo-DOV transects in terms of smaller standard error around the mean of the various metrics considered. However, across the 3 biogeographic regions sampled there was considerable variation in the magnitude of these differences. Results suggest that stereo-BRUV stations are, in general, a more cost-effective method for monitoring fish assemblages than stereo-DOV transects.KEY WORDS: Cost -benefit · Power to detect change · Biogeography · Baited remote underwater stereo-video · Diver operated stereo-videoResale or republication not permitted without written consent of the publisher Biol 9: 155-168, 2010 replicates and sites from pilot study data and, therefore, can also be used to evaluate the cost-effectiveness of different sampling methods.The complete sampling of reef fish communities in shallow waters is only possible using destructive methods. Indiscriminate methods such as dynamite have historically been used (Stephan 1904); however; the use of fish toxins such as rotenone (Krumholz 1948) have allowed more discrete and quantitative samples of the fish assemblage to be collected from complex habitats (Robertson & Smith-Vaniz 2008). Recent advances in diving technology have allowed these methods to be used to depths of 150 m, resulting in the description of large numbers of new cryptic species and observations of higher rates of endemism in deeper compared to shallow reefs (Pyle 2000). However, for most largescale studies, sampling the complete fish assemblage is likely unnecessary (Clarke & Warwick 1998) and destructive methods bias future samples obtained from the same locality and can compr...

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Section: Introductionmentioning

confidence: 99%

Cost-efficient sampling of fish assemblages: comparison of baited video stations and diver video transects

Langlois

Harvey²,

Fitzpatrick³

et al. 2010

Aquat. Biol.

239

156

View full text Add to dashboard Cite

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“…John et al, 1990;Barker et al, 1993;Gledhill, 2001), and new methods can account for detection probabilities of <1 when estimating species richness (Nichols et al, 1998;Johnson et al, 2013). Reading more frames will certainly provide more information but will also bring increased costs associated with the additional time and effort required (Rotherham et al, 2007;Al-Chokhachy et al, 2009).…”

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confidence: 99%

Estimating relative abundance and species richness from video surveys of reef fishes

Bacheler¹,

Shertzer²

2014

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Abstract-Underwater video sampling has become a common approach to index fish abundance and diversity, but little has been published on determining how much video to read. We used video data collected over a period of 6 years in the Gulf of Mexico to examine how the number of video frames read affects accuracy and precision of fish counts and estimates of species richness. To examine fish counts, we focused on case studies of red snapper (Lutjanus campechanus), vermilion snapper (Rhomboplites aurorubens), and scamp (Mycteroperca phenax). Using a bootstrap framework, we found that fish counts were unbiased when at least 5 of 1201 video frames within a 20-min video were read. The relative patterns of coefficients of variation (CVs) were nearly identical among species and declined as an inverse power function. Initial decreases in CVs were rapid as the number of frames read increased from 1 to 50. However, subsequent declines were modest, decreasing only by ~50% when the number of frames read increased by 300%. Estimated species richness increased asymptotically as the number of frames read increased from 25 to 200 frames, and reading 50 frames documented 86% of the species observed across all 1201 frames. Lastly, we used a generalized additive model to show that the most likely species to be missed were fast-swimming fishes that are solitary or form relatively small schools. Our results indicate that the most efficient use of resources (i.e., maximum information gained at the lowest cost) would be to read ~50 frames from each video.

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“…Developing robust and optimal designs of sampling for long-term surveys (i.e., the numbers of replicate trawls, sites, sampling occasions, etc. ), however, requires additional experiments quantifying spatial and temporal variation in patterns of abundance and the use of cost-benefit analyses (e.g., Kennelly et al, 1993;Rotherham et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…So, before implementing large-scale and long-term monitoring surveys, an important first step is to test the effects of different configurations of gear and sampling practices on retained samples (Gunderson, 1993;Rotherham et al., 2007). This is a necessary precursor to designing more accurate, precise and cost-effective sampling strategies (DeAlteris et al, 1989;Kennelly et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Sampling estuarine fish and invertebrates using demersal otter trawls: Effects of net height, tow duration and diel period

2008

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A strategy for developing scientific sampling tools for fishery-independent surveys of estuarine fish in New South Wales, Australia

Cited by 70 publications

References 17 publications

Cost-efficient sampling of fish assemblages: comparison of baited video stations and diver video transects

Cost-efficient sampling of fish assemblages: comparison of baited video stations and diver video transects

Estimating relative abundance and species richness from video surveys of reef fishes

Sampling estuarine fish and invertebrates using demersal otter trawls: Effects of net height, tow duration and diel period

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