aqua International Journal 8(1)
Volume 8, Issue 1 – November 2003
Volume 8, Issue 1 – November 2003
Ivan Sazima and Cristina Sazima: Daytime hunting behaviour of Echidna catenata (Muraenidae): why chain morays foraging at ebb tide have no followers, pp. 1-8
The daytime foraging of the chain moray (Echidna catenata) on grapsid crabs on exposed reefs at ebb tide and in tide-pools was studied in the Fernando de Noronha Archipelago, western Equatorial Atlantic (03°50’S, 32°25’W). Four hunting tactics were recorded both in and out of the water: (1) search at pool rims and rock bases, poking into crevices and holes; (2) stealthy approach to previously sighted prey; (3) chasing of prey; (4) ambush from crevices and under rocks. As the chain moray uses varied hunting techniques and its crab hunting is mostly visually guided, its generally unobtrusive foraging attracts little or no attention from tide-pool fishes. Part of the foraging is done out of the water on exposed reefs; fish are therefore unable to follow the moray and take advantage of its hunting activities.
Javad Ghasemzadeh, Walter Ivantsoff and Aarn: Historical overview of mugilid systematics, with description of Paramugil (Teleostei; Mugiliformes; Mugilidae), new genus, pp. 9-22
The history of the systematic relationships of the mugilids is reviewed, concluding with the modern concept of Mugilidae comprising 17 genera with 80 species, one of five taxa comprising ‘Smegmamorpha’. Paramugil, new genus, is erected for P. georgii and P. parmata, and 18 diagnostic morphological and osteological differences between Paramugil and Liza and/or Mugil and/or Valamugil listed.
Gerald R. Allen and Roger C. Steene: Chaetodontoplus vanderloosi, a new species of angelfish (Pomacanthidae) from Papua New Guinea, pp. 23-30
A new species of pomacanthid fish, Chaetodontoplus vanderloosi, is described from 3 specimens, 117.8-125.2 mm SL, collected at Samarai Island, Milne Bay Province, Papua New Guinea in 1972 and 2003. It is closely related to C. dimidiatus and C. melanosoma from Indonesia and the Philippines, but differs in colour pattern. The new species is mainly black except the head and adjacent dorsoanterior body is light grey to nearly white, with a predominately black caudal fin (except broad yellow posterior margin). Small juveniles are mainly black with a yellow median facial band, a yellow diagonal band from just in front of the dorsal fin to the pelvic fins, a broad yellow margin covering most of the dorsal fin, and a yellow caudal fin with a black submarginal bar.
Jansen Zuanon and Ivan Sazima: Vampire catfishes seek the aorta not the jugular: candirus of the genus Vandellia (Trichomycteridae) feed on major gill arteries of host fishes, pp. 31-36
Species of the trichomycterid catfish genus Vandellia (candirus) feed on blood from other fishes, usually entering the gill chamber of their hosts. However, exactly where these vampire fish attach themselves in the chamber to take blood remains unrecorded. Herein we present evidence that two candiru species, Vandellia cirrhosa and V. sanguinea, seek the major gill arteries. Both species bite mostly at the ventral or dorsal arteries, and the blood is presumably pumped into their gut by the hosts’ blood pressure. We suggest that candirus do not need any special sucking or pumping mechanism become rapidly engorged themselves with blood but simply use their needle-like teeth to make an incision in an artery. This being the case, the notion of blood-sucking by the candiru is misleading.
John E. Randall and John L. Earle: Novaculoides, a new genus for the Indo-Pacific labrid fish Novaculichthys macrolepidotus, pp. 37-43
The new genus Novaculoides is proposed for one species of labrid fish previously classified as Novaculichthys macrolepidotus (Bloch). The genus is distinct from Novaculichthys in possessing the following characters: anterior pair of canine teeth in jaws curving laterally; two or three oblique rows of small embedded scales on cheek; head short, its length 3.4-3.65 in SL; body moderately elongate, the depth 2.8-3.0 in standard length; longest dorsal and anal soft rays about equal in length; pelvic fins of males often longer than head, 3.1-4.2 in standard length. Novaculichthys is now monotypic for the species taeniourus (Lacépède).
|Dimensions||26.6 × 20.3 × 0.3 cm|
|print or online||