Our celebrity species this month is Hippocampus trimaculatus, aka the three-spot seahorse. Thanks, iSeahorse user davidr, for spotting this spotless three-spot!
Our latest featured iSeahorse observation is a trio of scenic snapshots nabbed by iSeahorse user sharejosie, aka Josie Jones. She saw all three seahorses - two Big-belly seahorses (H. abdominalis) and one Short-head seahorse (H. breviceps) - between October 6th and 8th in Melbourne, Australia. Both species are unique to the region, with H. abdominalis found in New Zealand as well.
Our latest featured fish is a thorny seahorse (Hippocampus histrix) with skin as orange as the Jack-o-lanterns currently adorning the porches of Vancouver (where our Canadian office is located). At the time that iSeahorse user designedforx snapped this photo, the citrus-hued steed was hanging out in Kenya’s Wasini Channel.
The latest iSeahorse VIP-horse is Hippocampus capensis, also known as the Knysna seahorse, an Endangered species hailing from just a few South African river mouths.
This month we’re highlighting a whole herd of White’s seahorses (Hippocampus whitei), thanks to scale-blazing scuba diver Tony Strazzari! Despite only joining iSeahorse on May 18th, Strazzari has posted over 140 seahorse observations under the username of tonydiver, backdated all the way to 2014.
By Kately Nikiforuk
May’s featured iSeahorse observation is a trio of jaw-dropping action shots, courtesy of user thumbwave (aka Craig Chaddock). The intrepid citizen scientist witnessed a great blue heron (Ardea herodias) pick up and immediately let go of a Pacific seahorse (Hippocampus ingens), which clutched its grassy holdfast throughout the ordeal. After the seahorse was dropped, Craig managed to capture the split second before it vanished beneath the water’s surface. From this novel angle, the seahorse almost looks like a mini Loch Ness monster.
Seahorses, though predators themselves, are preyed upon by a wide range of animals. More than 80 species have been found with seahorses or pipefishes in their bellies. Examples of known seahorse snackers are loggerhead sea turtles, fairy penguins, skipjack tuna, spottail porgies and horn sharks. Because of their low abundance and meagre caloric value, predators probably feed on seahorses opportunistically, rather than being specialized to hunt them. Pacific seahorses, which are Vulnerable (IUCN Red List), are far more threatened by the shrimp trawling industry than by opportunistic predators such as great blue herons.
So why was the heron’s catch released? Was it a slip of the beak or an outright rejection? Seahorses have bony plates instead of scales and aren’t very nutritious, so perhaps the bird simply didn’t have time for a crunchy, skimpy meal. Regardless of why this happened, there’s no question that these photos were impressively timed. Thanks for sharing with us, Craig!
Learn more about seahorse predators here:
Kleiber D., L.K. Blight, I.R. Caldwell, and A.C.J. Vincent. 2011. The importance of seahorses and pipefishes in the diet of marine animals. Reviews in Fish Biology and Fisheries 21(2): 205-223. DOI: 10.1007/s11160-010-9167-5
This month's featured iSeahorse observation highlights a champion hide-and-seeker, Denise’s pygmy seahorse (Hippocampus denise), courtesy of iSeahorse user maractwin. With their petite size and puppy dog eyes, they seem more like seadogs than seahorses
"It is difficult to understand and explain how on these lands, visited and studied by so many dedicated naturalists such as Charles Darwin and Alcides D´Orbigny that there were no records of seahorses inhabiting Patagonia."
Guest blog by Dr Diego Luzzatto
February’s iSeahorse featured observation is a pretty bigbelly seahorse and a pretty big deal - this marks iSeahorse’s 3,000th observation!!!
December’s featured observation, posted by iSeahorse user John Sear, is of a species that’s been pretty newsworthy as of late. So, do you want the good news or the bad news first? Well, you’ll actually get them both at once - White’s seahorse (Hippocampus whitei) is now recognized as an Endangered species, according to a 2017 IUCN Red List assessment. While it is obviously not a good thing for a species to be Endangered, their new status can be seen as a step in the right direction. Recognition of their declining population could provide a necessary push to implement more conservation strategies.
September’s featured iSeahorse observation is a jaw-dropping pic of two fused-jawed fish! Many species of seahorse are monogamous and thus often found in pairs, as is the case here.
iSeahorse's featured seahorse for Augustis… drumroll please... a mystery!
July’s showcased iSeahorse snapshot features a particularly photogenic Pontoh’s pygmy seahorse (Hippocampus pontohi).
June’s featured seahorse is a giant seahorse (Hippocampus ingens), spied off the coast of Baja, California by iSeahorse user afelix, despite some masterful camouflage.
May’s featured iSeahorse observation is of a great seahorse (Hippocampus kelloggi), submitted by an equally great iSeahorse contributor, Andrew Trevor-Jones!
April’s featured iSeahorse observation is a Jayakar’s seahorse (Hippocampus jayakari). This lovely portrait was taken off the coast of Dahab, Egypt, by iSeahorse user poseidon. The username poseidon is certainly apt for a fish-whispering diver, as the Poseidon of Greek mythology is said to ride a chariot pulled by aquatic equines called hippocampi, which allegedly have horse heads and fish tails (sort of like seahorses… or horse mermaids!).
Retired commercial diver (and regular iSeahorse contributor) ken_flan discovered this honey-hued head turner - a short-head seahorse (Hippocampus breviceps) - off the coast of Victoria, Australia.
February’s featured observation is actually three sightings of one bigbelly seahorse (Hippocampus abdominalis), all posted recently by iSeahorse user Andrew Trevor-Jones but recorded over the course of several years off the coast of New South Wales, Australia. This rotund beauty has been dubbed “Rosie”. She was identified as the same individual based on her distinctive spot pattern.