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In situ three‐dimensional video tracking of tagged individuals within site‐attached social groups of coral‐reef fish
Author(s) -
Engel Anael,
Reuben Yaela,
Kolesnikov Irina,
Churilov Dmitri,
Nathan Ran,
Genin Amatzia
Publication year - 2021
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.1002/lom3.10444
Subject(s) - damselfish , foraging , coral reef , coral reef fish , fish <actinopterygii> , reef , coral , fishery , ecology , computer science , geography , biology
Tracking the movement of all individual group members in their natural environment remains a challenging task. Using advances in computer vision and Deep Learning, we developed and tested a semi‐automated in situ tracking system to reconstruct simultaneous three‐dimensional trajectories of marked individuals in social groups of a coral‐reef fish. Our system has a temporal resolution of 10s of milliseconds, allowing for multiple 30‐min tracking sessions that have been repeated over weeks to months. We present the technique and illustrate its application for Dascyllus marginatus , a planktivorous damselfish that lives in social groups associated with branching corals. Our technique identified all individuals 85–100% of the time, with a mean spatial error of ~ 1.3 cm. It provides a cost‐effective semi‐automated tool for in situ research on movements and foraging of individuals within small site‐attached groups of animals in their natural environment.