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- Randy LATCHY
Randy LATCHY
My project consists of the optimization and standardization of a compact, mobile and automated counting tool for post-larvae of amphihaline species recruiting within the mouths of rivers in Reunion Island: the BichiCAM. This non-intrusive device was initially designed in 2016 to estimate the abundance and size distribution of benthic diadromous species. Thenceforth, it turns out to be a promising management and monitoring tool subject to improvements (Boussarie et al., 2016). Then the BichiCAM was remodeled and reworked in 2021 to allow correct counting of the post-larvae of two bichique species (Sicyopterus lagocephalus & Cotylopus acutipinnis) and to obtain data comparable to catches of fishermen (Borie et al., 2021).
As part of BichiCAM 3, I will bring several points of improvement and will set up experimental plans with the aim of achieving an effective inventory management tool and better estimating the real incoming flows within the systems.
Expand the panel of species detected by BichiCAM (ichthyofauna & carcinofauna): glass eel (Anguilla bicolor, A. marmorata, A. mossambica, A. bengalensis), other gobidae (Awaous commersoni, Stenogobius polyzona, Glossogobius giuris), eleotridae (Eleotris fusca, E. klunzingerii, E. Pellegrini, E. acanthopomus, E. mauritinianus), kuhlidae (Kuhlia rupestris, K. sauvagii, K. caudavittata) and crustaceans (Caridina typus, C. nilotica, C. serratirostris, Atyoida serrata, Palaemon concinnus, Macrobrachium australe, M. lar, M. hirtimanus, M. lepidactylus).
Carry out tests and calibrations on rivers with different hydromorphological conditions (flow rates, depth, wet width, slope, grain size, etc.) in order to establish a good relationship between the proportion of individuals counted and the proportion actually crossing the river (taking account fisheries).
References
Borie G., Faivre L. Randimbisoa H., Grondin H., Ponton D., Valade P., 2021, Projet « Bichique « la monté » : Mise en place d’une stratégie de suivi halieutique et environnemental de la pêcherie de bichiques de La Réunion. Projet réalisé par OCEA et l'IRD – UMR ENTROPIE avec le soutien financier de l'OFB dans le cadre de l'appel à projets "biodiversité outre-mer" paru en 2018. Rapport final.
Boussarie, G., Teichert, N., Lagarde, R., & Ponton, D. (2016). BichiCAM, an Underwater Automated Video Tracking System for the Study of Migratory Dynamics of Benthic Diadromous Species in Streams: BichiCAM for Studying Fish .