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aqua International Journal 23(2)

19.90

COMPLETE ISSUE

Volume 23, Issue 2 – 28 April 2017

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COMPLETE ISSUE

Volume 23, Issue 2 – 28 April 2017

Ivan Sazima: Deception, protection, and aggression in the mangrove: three juvenile fishes and floating leaves in Southeast Brazil, pp. 41-46

Abstract

Mangroves and similar habitats generally harbour rich and varied fish assemblages composed mostly of juvenile
individuals (nurseries). I report here on juveniles of three fish species that make use of floating leaves in mangroves, tidal creeks, and beaches with freshwater influence. The tripletail Lobotes surinamensis uses leaves as a form of masquerade (resemblance to decaying leaves) both as protection against potential predators and as disguise to approach prey (aggressive mimicry). The mullet Mugil liza uses leaves as shelter against potential predators. The leatherjacket Oligoplites saurus uses leaves mostly as cover to approach its prey. These three fish species illustrate the variety of opportunities to use floating leaves in mangrovelike habitats. No doubt there are additional uses, but the majority of them would likely be a way to elude potential predators in one of the most vulnerable life stages of a fish.

João Paulo Krajewski, Roberta M. Bonaldo and Ivan Sazima: Do cleaner wrasses rub on reef manta rays to remove their own parasites?, pp. 47-53

Abstract

Cleaner wrasses of the genus Labroides are the epitome of a cleaner fish. Herein we describe two cleaner wrasse
species, Labroides bicolor and Labroides dimidiatus, displaying a behaviour known as chafing or flashing. When chafing, a fish rubs itself against sandy bottoms, rocks, vessels, or other rough surfaces including sea turtles and sharks. We recorded the two cleaner wrasse species rubbing themselves against the rough skin of reef manta rays, Manta alfredi, on a coral reef cleaning station at Yap, Micronesia, western Pacific. As chafing is a way to relieve skin irritation and an alternative to reduce external parasites, we suggest that these specialised wrasse species use this behaviour to remove their own ectoparasites when other cleaning services are unavailable. The recorded ray-wrasse cleaning association is noteworthy, since the rays provide food and cleaning opportunity to the wrasses at the same time.

Book review: The teeth of non-mammalian vertebrates by B. Berkovitz & P. Shellis, p. 54

Dalton Tavares Bressane Nielsen: Description of two new species of the Melanorivulus zygonectes
species group (Cyprinodontiformes: Cynolebiidae) from Rio Xingu and Rio Tapajós basins, Brazil,
pp. 55-67

News: Aphanius sp., pp. 68-72

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Weight 0.160 kg
Dimensions 23.3 x 26.0 x 0.5 cm