Remoras, also known as shark suckers, are a family of eight species of fish that have sucker disks positioned above their heads that let them attach to moving objects to hitch a ride. They attach to sharks, turtles, ships, divers, and just about anything they can latch onto. Scientists have now discovered that the sucker disks of remoras are actually highly modified dorsal fins that expands during their development.
(Photo © Dave Johnson)(Source)
World’s smallest vertebrate: fish versus frog
via Natural History Museum
More and more really tiny species are being discovered, like a 7.9mm fish in 2006 and a 7.7mm frog in 2011. There’s increasing competition for the title of the ‘world’s smallest vertebrate’, but exactly how do you determine what is the smallest?
Natural History Museum fish expert (ichthyologist) Dr Ralf Britz helped analyse the world’s smallest fish, and vertebrate (back-boned animal), in 2006. Paedocypris progenetica is 7.9mm long and lives in the acidic swamps of Sumatra. He explains what’s involved in determining the smallest creatures.
Find an adult
The first step is to find an adult of the species. ‘You need to establish that you are dealing with a mature individual,’ says Ralf. ‘This means you have to confirm that its gonads are fully developed.’
'In fish, this is more easily done in females because you can check if the eggs in the ovaries are ripe.' Adult females will have bulging ovaries with relatively large eggs. Establishing the maturity of gonads in males is harder and requires making microscopic sections, says Ralf…
(images: T - Britz et al/ PLoS One - Paedocypris progenetica; B - 2012 Rittmeyer et al/ PLoS One - Paedophryne amauensis)
An underwater picture of a Kingfisher catching a fish…
- Originally posted at Penelope Bagieu’s blog
The sea is magnificent and stonking incredible. It makes us look like small fry. And I f*cking hate deep-sea trawling.
A look at the budwing mantis.
"Dude, the other day I ate a fish that was THIIIIS big!"
Sperm Drinking Corydoras Catfish
Several species of Corydoras catfish are known for their unique method of mating, which involves the female drinking the male’s sperm.
When these fish reproduce, the male will present his abdomen to the female. The female will then latch her mouth onto the male’s genital opening, creating the well known ‘T-position’ many species exhibit during courtship.
The female drinks the sperm released by the male. This sperm rapidly moves through her digestive tract and exits within a couple of minutes. It is discharged simultaneously with her eggs into a pouch formed by her pelvic fins, fertilising them in the process.
During this period, the female can swim away to deposit her eggs in private. In the wild, the eggs are laid on aquatic plants whereas in the aquarium, they are often deposited on the glass.
(C. sterbai depicted)
Image: Jan Ševčík; Gif from duandr1 via Youtube
Ahh, the mana-turkish scrub.
A majestic rare albino whale shark graces the ocean
Sometimes, Nature puts on a show that leaves Man awestruck. And these spectacular displays by two denizens of the deep left all who saw them beguiled by their grace and beauty. Divers were stunned by the sight of a 33ft albino whale shark as it glided through the waters off the coast of Darwin, an island in the Galapagos group. (Full Story)
::eyes all a-glitter:: :D !!!
Damaged Reefs and Dead Fish
Fishing with dynamite doesn’t just kill those fish that can be sold at the market. The explosion also kills hundreds of other fish in the area, which are left dead on the seafloor as bycatch.
Read more about the effects of blast fishing and other field notes from Africa: http://ocean.si.edu/blog/field-notes-east-african-coast
Photo Credit: (c) 2004 Berkley White/Marine Photobank