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07
Mar

Fish Movements

October 2022- In September, we embarked on a field expedition to re-initiate FAD and acoustic reseach among the FADs deployed off San Juan, Puerto Rico.  In this effort, our goals are to better describe fish movements relative to the FADs; fishing trip success and catch and effort; how FAD design can affect species abundance, presence, and biomass; and the impact that FADs have on local businesses and visitors to Puerto Rico.  Watch the video above or click here to learn about our recent field expedition off San Juan, PR, in September, where we re-initiated acoustic, camera, and tagging work whereby 4 dolphinfish, 2 yellowfin tuna, and a silky shark were tagged and released with acoustic transmitters.  We also redeployed sound hydrophones, temperature instruments, and monitoring cameras.  We intend to share updates on data collected from this work in our next newsletter due out in December.  

Past Updates – Fish Movements

2019 – Since 2015, we have deployed 12 acoustic V16TP tags on ten dolphinfish, a wahoo, and a blackfin tuna around the FADs. In addition, 547 plastic dart tags have been deployed on dolphinfish (539), wahoo (6), a blackfin tuna (1), and a silky shark. Plus, a total of 12 satellite tags were deployed on dolphinfish (10), a wahoo, and a silky shark.  This included 2 high-rate Microwave Telemetry X-Tags and 10 Wildlife Computers mrPAT tags. Below are some figures based on data acquired and collected through June 2019.
Figure 1  Broad dolphinfish conventional and satellite tag movements from the U.S. Caribbean Sea from June, 2015, to June, 2019.  Numbers indicate days at liberty.  Blue numbers represent movements acquired with satellite tags while white numbers represent movements acquired from conventional tag recoveries.
Figure 2 Fine-scale dolphinfish conventional and satellite tag movements in the U.S. Caribbean Sea from June, 2015, to June, 2019. Numbers indicate days at liberty. Blue numbers represent movements acquired with satellite tags while white numbers represent movements acquired from conventional tag recoveries. Yellow ovals represent FAD deployment sites.
Figure 3 Preliminary movement map for an adult male (47”) dolphinfish fitted with a geolocating satellite X-Tag (# 175815) recovered at a fish aggregating device (FAD) south of Isla Saona, Dominican Republic, on May 20, 2019. The green oval represents the animal deployment site while the red oval represents the recovery site. Blue ovals represent the most probable track while the pink ovals represent the least probable track. This is the raw geolocation track that has not been reprocessed. Preliminary depth data (in meters) associated with the movement is provided.
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Movimientos de Peces