Underwater Measurement Techniques Using Low-Power Lasers

Caimi, Frank M.; Tusting, R. F.

doi:10.1117/12.940695

Cited by 3 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For these species, this method produced an estimate of absolute abundance per reef. Measurements (total length, TL) of some fish were possible because the ROVs were equipped with a pair of Digi-Key 2.5 milliWatt red lasers aligned in parallel, separated by 3 cm as a frame of reference (Caimi and Tusting 1987). Fish must be nearly perpendicular to the camera and have both lasers illuminate their body to be measured.…”

Section: Gear 1: Remotely Operated Videomentioning

confidence: 99%

Direct estimates of reef fish abundance across an artificial reef network

Powers

Drymon

Hightower

et al. 2023

Can. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

Fisheries-independent surveys are commonly used to create indices of relative abundance. If properly designed and calibrated, these surveys may also be used to estimate absolute abundance Here, we demonstrate the efficacy of this approach by estimating the absolute abundance of red lionfish (Pterois volitans), gray triggerfish (Balistes capriscus), and red snapper (Lutjanus campechanus) across an extensive network of artificial reefs using camera counts, indices of relative abundance, calibration factors and index-removal estimators. From 2012-2017, per reef estimates increased for red lionfish (20 X), gray triggerfish (2.1 X) and red snapper (2.2 X). Network-wide absolute abundances were calculated by multiplying the average per reef estimate by the estimated number of reefs in the network. All increases were consistent with predictions of stock assessment (red snapper), management actions (gray triggerfish) or invasive species colonization (red lionfish). Our methodology demonstrates how estimates of absolute abundance can be derived from fishery-independent surveys and used to evaluate the outputs of stock assessments both in direction and magnitude and quantify critical ecosystem components.

show abstract

Section: Gear 1: Remotely Operated Videomentioning

confidence: 99%