Employing Acoustic Technology to Aid Snapper Counters in Hawai'i and Mitigate Overfishing
In a groundbreaking study published in the ICES Journal of Marine Science, researchers from the University of Hawaii have developed a method to accurately estimate the abundance and biomass of snapper populations using deepseek acoustic methods. This study, conducted in the deep-sea fishing grounds of the Hawaiian Islands, aims to provide data for sustainable fishing practices.
Snappers, found in nearshore, subtropical and tropical oceans with rocky, uneven bottoms between 100 to 400 meters deep, are notoriously difficult to count using traditional methods such as trawl sampling. The highly uneven, rocky bottom and potential habitat disturbance make trawl sampling inefficient and inaccurate.
To overcome this challenge, the researchers employed deepseek acoustic methods. These methods emit a pulse of sound that echoes off objects and can be analyzed for certain characteristics. The study aimed to determine the accuracy of detecting snapper species and estimating their abundance and biomass using this approach.
The researchers were able to separate Deep-7 snapper echoes from those of other fish, except for loosely grouped jacks at the large end of Deep-7 size range, locally known as kahala. They also identified four tightly-grouped smaller fish species. To achieve this, they paired specific echoes with fish of known species and sizes.
Important characteristics for separating snapper echoes from other fish include echo strength, individual swimming pattern, depth, distance from bottom, group density, number of fish in loose groups, and shape of tight groups of fish.
If additional data is available, the researchers predict they could successfully separate at least three of these fish types: kahala, unicornfish, and mackerel scad. If deepseek methods prove unsuccessful for the other two species, their biomass can be eliminated from the total count by simple thresholding.
Deepseek acoustic methods offer several advantages over traditional methods. They are non-intrusive, not limited by light, and rapidly and efficiently collect data over the water column. Underwater video observations, on the other hand, are limited by light and field-of-view distance, and placing cameras in the water can scare or attract fish.
The study conducted by researchers at the Pacific Islands Fisheries Science Center was focused on the Hawaiian Archipelago. If successful, this method could potentially be adapted to monitor snapper populations worldwide, providing valuable data for sustainable fishing practices and conservation efforts.
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