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An optical plankton counter (OPC) mounted on a towed Batfish vehicle was used to detect and estimate the abundance of euphausiids in the Emerald and La Have Basins of the Scotian Shelf, northwest Atlantic Ocean. Euphausiids (Meganyctiphanes norvegica and Thysanoessa inermis) were identified from their characteristic diameter distributions measured by the OPC. The diameter distributions containing euphausiid peaks were compared to several depth strata known to contain these animals. The depth strata containing euphausiids were established from acoust~cal tows made on the same cruise and the identification of animals was accomplished by sampling these acoustical layers with the BIONESS net sampler. The die1 migration patterns of the euphausiids were also identified from these diameter distributions. Euphausiid reaction to artificial lights mounted on Batfish and BIONESS showed increases in abundance estimates by a factor of 2x and 50x respectively. Experiments with artificial lights mounted on a remotely operated vehicle and camera platforms are also described. An artificial light mounted on a towed Batfish resulted in a distinct increase in euphausiid abundance estimates as measured by the OPC. Abundance estimates from the OPC are also compared to results from acoustical tows and showed agreement to within a factor of 2 and better.

Detection and abundance estimation of euphausiids using an optical plankton counter