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aqua International Journal 5(1)

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COMPLETE ISSUE

Volume 5, Issue 1 – November 2001

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COMPLETE ISSUE

Volume 5, Issue 1 – November 2001

Thelma L. P. Dias, Ierecê L. Rosa & Bertran M. Feitoza: Food Resource and Habitat Sharing by the three Western South Atlantic Surgeonfishes (Teleostei: Acanthuridae: Acanthurus) off Paraiba Coast, North-eastern Brazil, pp. 1-10

Abstract

Diet and feeding  behaviour of the three western South Atlantic acanthurids (Acanthurus bahianus, A. chirugus, and A. coeruleus) were analysed, based on stomach contents analysis and underwater observations. Data ere obtained at three natural reefs and two shipwrecks along the coast of Paraíba State, NE Brazil. The results of Schoener’s Index suggest that dietary overlap was not significant between species pairs; however, some degree of microhabitat segregation was observed. Juveniles of A. bahianus and A. chirurgus formed feeding aggregations, whereas juveniles of A. coeruleus foraged solitarily. Adults of the three studied species formed intra- or interspecific feeding groups. Following behaviour was observed between acanthurids and Halichoeres spp., Pseudupeeus maculates, and Sparisoma spp.

Alexei M. Orlov, Alexei M. Tokranov, and Andrei V. Vinnikov: Additional records of scaled scuplin Archaulus biseriatus Gilbert & Burke, 1912 (Cottidae, Teleostei) from the North Pacific, pp. 11-18

Abstract

The scaled sculpin Archaulus biseriatus gilbert & Burke, 1912 is reported from three new North Pacific records from off the northern Kuril Islands, Russia, and the central Aleutian Islands, Alaska, north of Seguam Island. This species was previously known from the type series from the Aleutian Islands, Petrel Bank in the southern Bering Sea, ad a recent report and redescription of a single specimen from the central Kuril Archipelago off Simushir Island (Yabe and Soma, 2000). Additional records from the northern Kuril Islands and the eastern Aleutian Islands north of Seguam Island are also reported. Notes on the morphology, habitat, and species associations of Archaulus are presented, and photographs of specimens are provided.

Richard Winterbottom: Two new gobiid fish species in Trimma and Trimmatom from the Indian and Western Pacific Oceans, pp. 19-24

Abstract

Two new gobiid fish species are described. Trimma stobbsi has no scales in the predorsal midline, a slight interorbital trench, unbranched fifth pelvic fin ray, and a distinct dark spot above und just anterior to the posterodorsal corner of the operculum. Trimmatom pharus has a scaled body, a reduced (20% or less of the length of fourth ray) and unbranched fifth pelvic fin ray, and the first four pelvic fin rays branched. Numerous dark bars (red in life) are present on head and body. Trimmatom pharus is considered to be part of the T. eviotops species group. Both new species are found in the Indian and western Pacific Oceans.

William F. Smith-Vaniz, Ukkrit Satapoomin, and Gerald R. Allen: Meiacanthus urostigma, a New Fangblenny from the Northeastern Indian Ocean, with Discussion and Examples of Mimicry in Species of Meiacanthus (Teleostei: Blenniidae: Nemophini), pp. 25-43

Abstract

The 3 subgenera and 25 species of Indo-Pacific blenniid fishes of the fangblenny genus Meiacanthus are differentiated in a key. Meiacanthus urostigma, new species, is described from the Surin Islands and northern Sumatra. This region of the Indian Ocean appears to be a localized area of endemism, attributable to glacial sea-level lowering events. The new species is distinguished from its congeners by its colour pattern characterized by a uniformly pale tan body with a narrow dark lateral stripe extending from the snout to near the beginning of the bright orange-yellow caudal peduncle where it is typically interrupted and replaced by an elongate black spot. The new species is the second known member of the subgenus Allomeiacanthus (type species Meiacanthus ditrema Smith-Vaniz). This subgenus differs from the other subgenera most notably in having a toxic buccal gland that is ventrally positioned and encapsulated by the dentary bone, absence of a lateral line, and only 2 pores (3 in the other subgenera) in the mandibular and posttemporal series. Juveniles of the new species appear to be social mimics of similar-sized individuals of the cardinalfish Cheilodipterus qunquelineatus. Mimetic relationships involving species of Meiacanthus are discussed and colour photographs are given of selected mimetic pairs.

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