Deep Water fish with light

Pic: Peter TyldesleyOceanic lightfish (Vinciguerria nimbaria) discovered in East London

Beacon Bay resident, Peter Tyldesley, was walking the stretch of coast between the Nahoon River and Bonza Bay when he happened upon a tiny unusual fish species. Not familiar with the silvery fish but noting a set of photophores (specialised structures that emit light) he saved the specimen and later presented it to the East London Museum.

Museum fish specialist Greg Brett was intrigued and immediately commented that the photophores indicated a deep dwelling oceanic species. He proceeded to key the species to establish identification by using the seminal Smith’s Sea Fishes of Southern Africa.

Pic: Peter TyldesleyAfter some deliberation he settled on the species being an Oceanic lightfish, , which was also confirmed by fish expert Phil Heemstra, Curator Emeritus of the SA Institute of Aquatic Biodiversity in Grahamstown.

These tiny fish (reaching a total length of only 4.8 cm) live in the oceanic water column at depths of between 200-400 meters. They migrate vertically in the water column feeding predominantly on copepods (minute marine crustaceans) during the afternoon and early evening. They have a wide distribution around the world.

The scientific name of the fish is named after Deco Vinciguerria (1856-1934) an Italian ichthyologist from Genova.

Tuna isnt tuna

2006-07-07 14:48:58 by ikkyu

One for instance is albacore vs chunk light. albacore is a much larger fish than the tuna that provides meat for cans of chunk light tuna. i.e. it's further up on the food chain so ingests and builds up more mercury than the smaller skipjack.
the rule of thumb is the larger the pelagic (deep water fish)the more likely it is to have high mercury concentrations.
mercury will mess with your brain and nerves. the term mad as a hatter came about as a result of insanity being an occupational hazard of hatmakers who, at that time, used mercury in the hatmaking process.
in adults, the effects of mild mercury poisoning are reversable to a large extent

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