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Many coral reef fish regularly visit cleaning stations to have ectoparasites removed by cleaner fish or shrimps (Cote, 2000; Bshary & Schäffer, 2002; Chapuis & Bshary, 2009; Vaughan et al., 2016). Cleaners often attract potential clients by using visual cues, such as dance behaviour (Becker et al., 2005), signalling the location of the cleaning station while leading the client away from competing cleaners. Visual signals however, only work during the day suggesting that cleaning stations are closed at night. Militz and Hutson (2015) firstly observed diminished nocturnal cleaning by the shrimp Lysmata amboinensis (De Man, 1888) under laboratory conditions, and only one observation has been reported from a coral reef (Bonaldo et al., 2015).An individual of the cleaner shrimp Urocaridella antonbruunii (Bruce, 1967) (cf. Anker & De Grave, 2016, fig. 108) was observed carefully approaching a sleeping rabbitfish Siganus canaliculatus (Park, 1797) during a night dive in the Davao Gulf, Philippines, on 2 October 2010 (fig. 1A). Once the shrimp ascended upon the siganid, it started cleaning the siganid’s skin and continued doing so for about 10 min (fig. 1B). The cleaner shrimp Urocaridella antonbruunii may be specialized in nocturnal cleaning of fish avoiding competition with diurnal cleaners.Fig. 1.Urocaridella antonbruunii
Crustaceana – Brill
Published: Jan 10, 2018
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