Measurements for genetic studies of populations This video illustrates taking measurements and samples from teleost fish that are destined for genetic studies of populations (that is, ***yzing genetic differences within one same species). Each specimen is given an inventory number then weighed, measured and ***ed Samples destined for DNA sequencing (for Barcoding, phylogeny and populations genetics) are taken. Trawl station 21 ID 496 -- January 15, 2008 -
Underwater cam Aurora Australis-2 The seafloor being observed shows a continuous tapestry of sessile organisms, dominated by colonial ascidians (sea squirts) and bryozoans. A few big white sponges are her and there. This shows the milieu is fairly stable, so this area has not been scrubbed by floating icebergs. All these organisms feed by filtration: they capture particles suspended in the water. Teleost vertebrates are seen passing in the field of vision: they are from the genus Trematomus.
The friendly remora Most people consider remoras to be no-good hangers-on, sponging off well-meaning marine megafauna. But on a recent Georgia Aquarium research trip to Mexico to study whale sharks, one of the staff divers, Elliott Jessup, had an incredible encounter with one of the most inquisitive fish any of us have ever seen, and scientist/videographer Bruce Carlson caught the whole thing in HD. The waters were full of whale sharks and their attendant remoras, when this little guy took a real liking to Elliott, even attaching to his butt, and eating his hair. Footage copyright 2010 Bruce Carlson/Georgia Aquarium and used with permission
Canadian shipbuilders to design new coast guard vessels The Canadian government has announced that contracts have been awarded for the design of the Canadian Coast Guard's new offshore science vessels. Hyundai Merchant Marine has announced that it had achieved $2.1 billion in sales and $139 million in operating profit in the second quarter of 2010.
Supplemental video This video shows a flickering spot of light with and without a surround with an equal mean luminance as the flickering spot. This research was published in the journal Philosophical Transactions of the Royal Society B in the paper: Teleost polarization vision: how it might work and what it might be good for by Maarten Kamermans and Craig Hawryshyn. The doi link for the article is
Male_Epinephelus_marginatus_agressive_towards_females (Dusky Groupers) A bottom-dwelling fish widely distributed in the Mediterranean Sea, Eastern Atlantic and Western Indian Ocean. The dusky grouper is a protogynous hermaphrodite, which means it matures as a female (after around 5 years of age) but later develops into a male as it grows larger and older (9 - 16 years old). The dusky grouper lives a relatively solitary and sedentary life, except during the breeding season (June-September) when they form aggregations, usually in the ratios of 7 females to 1 male. Dominant males establish territories and demonstrate strong territorial behavior towards neighbouring males and smaller females. Diet consists of crustaceans, molluscs and fish. Over-fishing and spearfishing have caused a dramatic decline in the numbers of this species, leading to the banning of spearfishing of this species in France (1993). The dusky grouper was recently added to the endangered teleost list in Annex 3 of the Bern Convention. Footage: Freediver George Pavlides
A Region of Scientific Excellence. Nonspecific immune system of teleost fish