Estimating reef fish size distributions with a mini remotely operated vehicle-integrated stereo camera system
Open Access
- 4 March 2021
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 16 (3), e0247985
- https://doi.org/10.1371/journal.pone.0247985
Abstract
We tested the efficacy of a stereo camera (SC) system adapted for use with a remotely operated vehicle (ROV) to estimate fish length distributions at reef sites in the northern Gulf of Mexico. A pool experiment was conducted to test the effect of distance (1, 2, 3 or 5 m), angle of incidence (AOI; 0° to 40° at 5° increments), and SC baseline distance (BD; BD1 = 406, BD2 = 610, and BD3 = 762 mm camera separation) on the accuracy and precision of fish model length (288, 552, or 890 mm fork length) estimates compared to a red laser scaler (RLS). A field experiment was then conducted at 20 reef sites with SCs positioned at BD1 to compare fish length distribution estimates between the SC and RLS systems under in situ conditions. In the pool experiment, mean percent errors were consistently within the a priori selected threshold of ±5% at AOIs ≤10° at all distances with all four systems. However, SCs produced accurate estimates at AOIs up to 30° at all distances tested; 2–3 m was optimal. During reef site surveys, SCs collected 10.4 times as many length estimates from 4.3 times as many species compared to the RLS. Study results demonstrate that, compared to laser scalers, ROV-based SC systems can substantially increase the number of available fish length estimates by producing accurate length estimates at a wider range of target orientations while also enabling measurements from a greater portion of the cameras’ field of view.Funding Information
- National Marine Fisheries Service, National Oceanic and Atmospheric Administration (NA16OAR4170181)
- Florida Fish and Wildlife Research Institute (FWC-16188)
This publication has 49 references indexed in Scilit:
- Fish Community and Trophic Structure at Artificial Reef Sites in the Northeastern Gulf of MexicoBulletin of Marine Science, 2011
- Size, growth, temperature and the natural mortality of marine fishFish and Fisheries, 2010
- Cost-efficient sampling of fish assemblages: comparison of baited video stations and diver video transectsAquatic Biology, 2010
- Bait attraction affects the performance of remote underwater video stations in assessment of demersal fish community structureMarine Ecology Progress Series, 2007
- Habitat structure and fish: assessing the role of habitat complexity for fish using a small, semiportable, 3‐D underwater observatoryLimnology and Oceanography: Methods, 2007
- Influence of scuba divers on the avoidance reaction of a dense vendace (Coregonus albula L.) population monitored by hydroacousticsFisheries Research, 2006
- A comparison of underwater visual distance estimates made by scuba divers and a stereo-video system: implications for underwater visual census of reef fish abundanceMarine and Freshwater Research, 2004
- Comparison of abundance and spatial distribution of burrowing megafauna from diver and remotely operated vehicle observationsMarine Ecology Progress Series, 2002
- Body size and shoaling in fishJournal of Fish Biology, 2000
- ROV Image Scaling with Laser Spot PatternsUnderwater Technology, 2000