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New tetra from the upper rio Tapajós, Brazil

April 15th, 2013 — 10:15pm

Hyphessobrycon peugeoti © Ingenito et al.

A new tetra of the genus Hyphessobrycon has been described from affluents of the middle rio Juruena, itself a tributary in the upper rio Tapajós basin, Mato Grosso State, Brazil. Continue reading »

Category: New Species, News | Tags: , , , , , , | 2 comments »

Sex ratio in kribensis influenced by environment

April 3rd, 2013 — 6:29pm

Adult male; red operculum morph (?) © Tino Strauss

Scientists from the University of Alberta, Canada, have ascertained that the pH of water influences both sex ratio and male phenotype in the kribensis, Pelvicahromis pulcher. Continue reading »

Category: News, Science | Tags: , , , , | 3 comments »

Rasbora dusonensis and R. tornieri redescribed

March 27th, 2013 — 11:02am

Preserved specimens of R. dusonensis (top) and R. tornieri (bottom), both collected from the Sungai (river) Gelam, Sumatra © Ng & Kottelat

The identities of both species have been unclear for a number of decades but are resolved in a new paper by ichthyologists Heok Hee Ng and Maurice Kottelat published in the journal ‘Zootaxa’ last week. Continue reading »

Category: Ichthyology, News | Tags: , , , | Comment »

Scientists confirm first two-headed bull shark

March 26th, 2013 — 8:27am

Specimen after being removed from the body of its mother © Michael Wagner

Scientists have confirmed the discovery of the first-ever, two-headed bull shark.

The study, led by Michigan State University and appearing in the Journal of Fish Biology, confirmed the specimen, found in the Gulf of Mexico April 7, 2011, was a single shark with two heads, rather than conjoined twins. Continue reading »

Category: Discoveries, News | Tags: , , | 2 comments »