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SC/69A/CMP/15
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Resource ID
19966
Access
Open
Document Number
SC/69A/CMP/15
Full Title
Franciscana, Pontoporia blainvillei, dead stranded and rescued from incidental capture at the Río Negro Estuary, Patagonia, Argentina (2003 – 2023)
Author
Iñíguez Bessega M.A., Winter, M., Abate S., Seijas V.A., Hevia, M., Alarcón Saavedra A. And Failla M.
Authors Summary
Summary to come
Publisher
IWC
Publication Year
2023
Abstract
There were 34 franciscana dead stranded and rescued at the Río Negro Estuary, Patagonia, Argentina, between 2003 and 2023. The years with the highest stranding records were 2014 and 2020 (n=6). Autumn and spring were the seasons with the lowest and highest number of strandings, respectively. These strandings comprised 15 females, 6 males and 13 unknowns. Total body length of females ranged from 64 cm to 155 cm and males ranged from 70 cm to 138 cm. Five of the strandings involved calves and occurred within birth periods reported previously for the species at the Río Negro Estuary. Only in three P. blainvillei was possible to perform a complete necropsy. One of the specimens showed multifocal pneumonic lesions from which Klebsiella pneumoniae was isolated and identified microbiologically. In a second specimen, Pseudomona sp. and coagulase-negative Staphylococcus was identified, and in a third specimen tuberculosis by a member of the Mycobacterium tuberculosis complex was found. Despite these results, it was not possible to be certain that they were the causes of death of these three individuals. Three franciscanas had beak deviations. A total of 79 otoliths (38 left otoliths + 41 right otoliths) representing 41 specimens of white croaker (Micropogonias furnieri) were found in a stomach content analyzed. Eleven showed signs of being by-caught (four with net marks, four entangled in fishing gears or reported by the fishermen who by-caught them (n=3)). This is the first report of franciscana entanglements in sport fishing gear. The results in this paper should enhance local capacity to conduct research, contribute with baseline information for future studies to determine the status of the population at the FMA IVe and provide useful information that responds to some of the actions identified in the species CMP.