Se evaluó la abundancia del pez león invasor Pterois volitans mediante censos visuales realizados en 2015 y 2016 en 54 sitios de seis localidades con arrecifes de coral a lo largo de la costa Caribe colombiana. El invasor se observó en todos los lugares y en la mayoría de las inmersiones, con una frecuencia de avistamiento de 88 %, valores de abundancia desde 0 hasta 9,7 ± 2,1 ind/250 m2 (388 ind/ha) y un promedio de 0,8 ± 1,3 ind/250 m2 (32 ind/ha). La densidad media fue similar a los valores reportados en otros trabajos que contaron pez león en una amplia escala espacial en el área invadida y el valor más alto se aproximó a la densidad máxima estimada en Colombia y otros lugares del Caribe.
Cryopreservation has been recently applied to coral gametes and tissue with successful results that can be applied for different purposes on coral conservation and restoration. In this study, we decided to determine the sperm morphology of the coral Orbicella faveolata and assess the feasibility of sperm cryopreservation using a combination of intracellular (1,2-Propadiol) and extracellular (milk) cryoprotectants, and two frozen treatments for 24 h. Mature spermatozoa had a triangular-like head shape measuring 4.10 ± 0.69 μm(mean ± SD) and long flagellum (43.24 ± 7.99 μm). Fresh sperm remained viable and mobile for more than five hours after being released from the gamete bundles. After cryopreservation, all post-thaw sperm components assessed (morphology, motility and viability) showed no difference in contrast to fresh sperm. This study is the first report of cryopreservation of O. faveolata sperm, however further research is needed to increase the success of the cryopreservation protocol for broad-scale application.
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