Crustaceans ectoparasites and epibionts of humpback whales, Megaptera novaeangliae (Cetacea: Balaenopteridae), in the Colombian Pacific. We recorded three species of crustacean ectoparasites and epibionts in two calves and four adults of humpback whale (Megaptera novaeangliae) that in the breeding season 2010 visited PNN Gorgona and Bahía Málaga, Colombian Pacific: the amphipod Cyamus boopis and the barnacles Coronula diadema and Conchoderma auritum. These crustaceans adhere to calves and adults and are present in the caudal fin, dorsal fin, back of the body (near the blowhole) and ventral side of the lower jaw. Ectoparasites and epibionts recorded here may influence the movement, feeding and behavior of whales. We found a calf of no more than three months of age with epibionts: epibionts seem to attach to whales in tropical waters, most likely in Colombian waters. KEY WORDSCrustacean, amphipods, barnacles, Megaptera novaeangliae, Colombian Pacific. RESUMENSe registran tres especies de crustáceos ectoparásitos y epibiontes en dos ballenatos y cuatro adultos de ballena jorobada (Megaptera novaeangliae) que visitaron el PNN Gorgona y Bahía Málaga en el Pacífico colombiano, en la temporada reproductiva del año 2010: el anfípodo Cyamus boopis y los cirripedios Coronula diadema y Conchoderma auritum. Se encontró que estos crustáceos se establecen en las aletas caudal y dorsal, en la parte dorsal del cuerpo cerca al espiráculo, y en la parte ventral de la mandíbula inferior. Se adhieren tanto a ballenas adultas como a ballenatos de corta edad. Los ectoparásitos y los epibiontes registrados pueden incidir en el desplazamiento de las ballenas, en la alimentación y en su comportamiento. Los epibiontes se adhieren a las ballenas en aguas tropicales, muy posiblemente en aguas colombianas, pues encontramos un ballenato de a lo sumo tres meses de edad con epibiontes.
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