Generic Lionfish

A turbulent, bizarre and downright strange year for fish, our list of the Top Ten Fish Stories of 2010 will have you scratching your head, wiping away tears and laughing all in one sitting. To hold you over until 2011, we put together the wildest and most comprehensive list of fish stories. So sit back, and enjoy the ride.

Top Ten Fish Stories of 2010

1. Nothing affected fish more strongly in 2010 than the BP Gulf Oil Spill . Going down in history as the worst man-made ecological disaster in antiquity, the repercussions of this tragedy are truly stunning. According to the official report released January 1, 2011 by the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling, “Organisms are exposed to oil through ingestion, filtration, inhalation, absorption, and fouling.” With ecological and economical losses proving difficult to pinpoint exactly, 2010 will nonetheless go down in the fish-histories as a time of great doom, death and terrible loss.
2. Making a strong statement for endangered and extinct species the world over, the Lake Saiko salmon reemerged from the pages of history in 2010. Thought to be extinct for over half a century, the “kunimasu” or “black kokanee” salmon materialized from the murky beyond, laying testament to the true adaptability of this remarkable species. Like the infamous snail darter fish of the Tellico Dam controversy, the black kokanee baffled researchers and proved once again that life always finds a way. Look also to salmon in Alaska and Derbyshire England for inspiration – both species experiencing respective rebounds in 2010. We’ll have to get one of these guys in an aquarium , just in case they try to run off on us again!
3. In 2010, high-fiving a fish became possible for the first time with the discovery of a mysterious “pink handfish” off the Australian island of Tasmania. Walking with its fins rather than swimming, this fish marks an exciting chapter in the voluminous and burgeoning book of “unknowns” discovered in the world’s oceans to date. Indeed, on the weird-o-meter, this fish gives the angler fish (with its spooky, head-dangling light bulb) a run for its money.
4. The Bluefin Tuna has been in the news at every turn in 2010. Between the BP oil spill and over-fishing sparking controversy in the EU, this species of fish should be on every fish-aficionados mind.
5. Although mammals, dolphins made a statement in 2010 that spoke volumes about the difference between mammalian brains and those of fish. In the wake of the BP oil spill, unlike sea turtles or fish, dolphins showed their smarts by swimming away from deadly oil plumes. What does this tell us about fish? Simply put, fish need more help in a human dominated world, which should in good conscience influence policy-making in the coming years.
6. Try squeezing one of these suckers into a fish tank and you might have the makings of a freak show on your hands! One of 38 species discovered around Greenland since 1992, the “longhead dreamer” anglerfish came seemingly screaming off the pages of your favorite science fiction novel in 2010 to send chills up the spines of people worldwide. Not only does this fish look like a monster found on a 14th Century sea map, it illustrates the vastness of the true “final frontier” – the Earth’s mysterious and largely unexplored oceans. Knowing more about the surface of the moon than about our own oceans, this species has shown mankind that we have only scraped the surface on what lies beneath the briny beyond. So Bigfoot, move aside! There are countless species yet to be discovered beneath the world’s waves.
7. Calling to mind the archetypal image of a mad scientist bringing a new species to life —“It’s Alive! It’s Alive”—“Transgenic salmon ” made their real debut in 2010 as mankind’s most recent installment in a long line of playing god. Modified by scientists for human consumption, what was once an Atlantic salmon has been spliced with the DNA of two other fish species to create a hybrid that reaches full size in just half the time of a regular salmon. One has to wonder, is this exciting, or just plain scary?
8. Mankind’s interest in missing links led to the repeal of longstanding Darwinian Theory pertaining to a species of hybrid that formerly spanned the gap between tetrapods and fish. A Tiktaalik fossil that was once accepted as the missing link between fish and tetrapods was recently supplanted for an even older fossil discovered in Poland of tetrapod tracks that tell quite a different story. This new evidence has effectively set scientists back to their laboratories, searching for the true missing link between fish and tetrapods.
9. People are finding new and surprisingly simple solutions to battle invasive fish species in the Florida Keys. A rising star in the invasive fish ranks, the lionfish has overtaken the warm, pristine waters of the Florida Keys in 2010. In the words of the Associated Press, people in the Keys are taking the tact, “If you can’t beat them, eat them,” with the Reef Environmental Education Foundation most notably releasing “The Lionfish Cookbook.” Now, if we could only find a way to make the zebra mussel or lamprey eel appetizing, we would really be in business.
10. Just when you thought things couldn’t get any stranger, enter the infamous Snakehead fish of Australia. Sure, we’ve all seen scary looking fish before, but before now, we only worried about them in the water. That’s right, this invasive species, known to inhabit Oceania, is worried to make landfall in Australia if action isn’t taken to curb the spread of this strange beast. So what makes this species so strange? It’s a fish that can breathe air and hunt on land. Enough said.

Guest post by: FishTankWarehouse.com

Yucatan peninsula

A Mexican skeleton which was ritually laid to rest in a cave that was once devoid of water, lends clues as to first Americans.

The skeleton which was discovered was supposedly laid to rest more than ten thousand years ago. It is one of the oldest such skeletons in the Americas, and was found in an undersea cave along the Yucatan Peninsula in Mexico.

Back when the skeleton was laid to its final resting place, the region was mostly desert, and the skeleton could lend clues which may shed some light on how he first Americans arrived, and just who they were.

Just about eighty miles south of Cancun, the intricate system of caverns of Chan Hol, which means “little hole”, is like a deep valley along the coast of the Caribbean.

German cave divers back in 2006, swam a remarkable 1,800 feet into the dark treacherous underwater tunnels and, quite by accident, happened across the Ice Age human’s remains ad sent notice to the archaeologists located in the surrounding state of Quintana Roo.

Over the past three years scientists under the guidance of the director of the Desert Museum in Saltillo, Mexico, Arturo Gonzalez, have been poking around and documenting the bones in place, so as not to disturb the scene and lose any vital things which might be offered by the surroundings.

It’s really astounding to think of all the ancient marvels which lie in wait for us under the ocean waves, if only we strap on a scuba tank.

Scientists from the U.S. Geological Survey (USGS) have revealed that largemouth bass injected with oestrogen produces less hepcidin than normally. Hepcidin is an important iron-regulating hormone in fish, amphibians and mammals, and researchers also suspect that hepcidin may act as an antimicrobial peptide. In vertebrate animals, antimicrobial peptides are the body’s first line of defence against unwelcome bacteria and some fungi and viruses, so if there’re right, a lowered amount of these compounds is certainly not good news.

“Our research suggests that estrogen-mimicking compounds may make fish more susceptible to disease by blocking production of hepcidin and other immune-related proteins that help protect fish against disease-causing bacteria,” says lead author Dr. Laura Robertson.

You can find more info in the study “Identification of centrarchid hepcidins and evidence that 17β-estradiol disrupts constitutive expression of hepcidin-1 and inducible expression of hepcidin-2 in largemouth bass (Micropterus salmoides)” by Laura Robertson, Luke Iwanowicz and Jamie Marie Marranca in the latest issue of the journal Fish & Shellfish Immunology. It is the first published study demonstrating control of hepcidin by estrogen in any animal.

Modern seals, walruses, and sea lions are all descendants of animals that once lived on land but eventually swapped their terrestrial lifestyle for a life in the ocean. Until now, the morphological evidence for this transition from land to water has been weak, but researchers from Canada and the United States have now found a remarkably well preserved skeleton of a newly discovered carnivorous animal: Puijila darwini.

Skeletal illustration of Puijila darwini.
Credit: Mark A. Klingler/Carnegie Museum of Natural History

Seals, walruses and sea lions all have flippers; a type of limb perfectly adapted for swimming and moving around in water. But how could a land living animal develop flippers? The adaptation evolved gradually over a long period of time, as some land living animals adapted semi-aquatic habits. New research now suggests that the genus Puijila is the “missing” evolutionary link between our modern seals, walruses and sea lions and their terrestrial ancestors.

Puijila darwini is described as having fore-limbs comparatively proportionate to modern carnivorous land animals rather than to pinnepeds*, a long tail, and webbed feet.

“The remarkably preserved skeleton of Puijila had heavy limbs, indicative of well developed muscles, and flattened phalanges which suggests that the feet were webbed, but not flippers. This animal was likely adept at both swimming and walking on land. For swimming it paddled with both front and hind limbs. Puijila is the evolutionary evidence we have been lacking for so long,” says Mary Dawson, curator emeritus of Carnegie Museum of Natural History.

The Puijila darwini skeleton was found in Nunavut, Canada in the remains of what was once a crater lake on coastal Devon Island. The first pieces of the skeleton were found in 2007, but the important basicranium wasn’t found until researchers paid a new visit to the site in 2008. Without a basicranium it is much more difficult to determine taxonomic relationships.

Based on Paleobotanic fossils, Devon Island had a cool, coastal temperate climate during the Miocene when Puijila darwini roamed the seashore. The conditions were quite similar to modern-day New Jersey and the lakes would freeze during the winter, something which probably prompted Puijila darwini to move over land from the lake to the sea in search of food.

“The find suggests that pinnipeds went through a freshwater phase in their evolution. It also provides us with a glimpse of what pinnipeds looked like before they had flippers,” says Natalia Rybczynski, leader of the field expedition.

The idea that semi-aquatic mammals may have undergone a transition from freshwater to saltwater is not new. In the On the Origin of Species by the Means of Natural Selection, Charles Darwin writes “A strictly terrestrial animal, by occasionally hunting for food in shallow water, then in streams or lakes, might at last be converted in an animal so thoroughly aquatic as to brace the open ocean.”

The oldest well-preserved pinniped animal belongs to the genus Enaliarctos and was a sea living creature with flippers. This species has been found on North Americas northern Pacific shores which have lead researchers to believe that the evolution of pinniped animals may have taken place mainly around the Arctic. This new finding of Puijila darwini strengthens that notion.

You can find more information about Puijila darwini and the origin of pinnipeds in the April 23 issue of the journal Nature.

http://www.nature.com

http://www.nature.com/nature/index.html

* The pinnipeds are a widely distributed and diverse group of semi-aquatic marine mammals. It contains the families Odobenidae (walruses), Otariidae (eared seals, including sea lions and fur seals), and Phocidae (earless seals). The name is derived from the Latin words pinna, which means wing or fin, and ped, which means foot. The pinnipeds are therefore also known as fin-footed mammals.

The remains of a 15 meter[1] long sea living predator has been found in Svalbard, an archipelago located about midway between mainland Norway and the North Pole. The animal, a species of pliosaur dubbed Predator X by the group of scientists who discovered it, lived in the ocean 147 million years ago during the Jurassic period.

Predator X hunting (Photo: Atlantic Productions)

The skull of Predator X is twice as big as the skull of a Tyrannosaurus Rex and researchers believe the jaws of this hunter could exert a pressure of 15 tonnes[2]. The weight of the live animal is estimated to be around 45 tonnes[3].

“It is the largest sea dwelling animal ever found and as far as we know it is an entirely new species”, says palaeontologist Espen Madsen Knutsen[4] from the Olso University in Norway to Swedish newspaper Dagens Nyheter.

Knutsen is a part of the research team who dug out the skull and backbone of the creature during a two week long research expedition to Svalbard in June 2008. The remains were first discovered by Professor Jörn Hurum[5] from the Natural History Museum at Oslo University in 2007. Hurum noticed a piece of bone sticking up from the permafrost, but since it was the last day of the 2007 expedition the group was forced to leave the bone behind without any further investigation after having jotted down its GPS position.

Parts of the head and backbone was dug out during the abovementioned June 2008 expedition and together with an earlier find of a smaller specimen of the same species located just a few kilometres away, scientists have now managed to map together a good picture of what the live animal once looked like.

“We haven’t unearthed a high number of parts yet, but the parts that we do have are important ones and this has made it possible for us to create an image of what Predator X once looked like”, says Knutsen.

The digg site (Photo: Atlantic Productions)

In the excavated area, palaeontologist have found roughly 20,000 bone fragments – the remains of at least 40 different sea dwelling Jurassic animals. Once you’ve started digging in this region, it is fairly easy to spot the bones since their pale colour contrasts sharply against the black earth of the Svalbard tundra. The main difficulty is instead the short dig period and the fact that much time is spent restoring the excavated area after each dig.

“Each time we leave a dig site we have to restore the area. There can be no traces of our activities. This forces us to use half of our time digging up the same spot all over again when we return”, Kutsen explains.

Svalbard lies far north of the Arctic Circle and the average summer temperature is no more than 5°C (41°F), while the average winter temperature is a freezing −12 °C (10 °F). In Longyearbyen, the largest Svalbard settlement, the polar night lasts from October 26 to February 15. From November 12 to the end of January there is civil polar night, a continuous period without any twilight bright enough to permit outdoor activities without artificial light.

The team plans to return to Svalbard this summer to carry out more digging. They hope to find another specimen in order to make the skeleton more complete, and they also wish to unearth the remains of other animals that inhabited Svalbard at the same time as Predator X.

If you wish to learn more, you can look forward to the documentary shot by Atlantic Productions during the Svalbard excavations. The name of the documentary will be Predator X and the animal is actually named after the film, not the other way around. The film will be screened on History in the USA in May, Britain, Norway and across Europe later this year and distributed by BBC Worldwide.

Pliosaur crushing down on Plesiosaur with 33,000lb bite force (Ill.: Atlantic Productions)

All the scientific results will be published in a full scientific paper later this year.

You can find more Predator X information (in English) at the Natural History Museum, University of Oslo: http://www.nhm.uio.no/pliosaurus/english/

A new disease has been discovered; a disease that effects both Leafy seadragons (Phycodurus eques) and Weedy seadragons (Phyllopteryx taeniolatus).

The disease, which as now been described by veterinary pathologists, is a type of melanised fungus that causes extensive lesions and necrosis of the gills, kidneys and other areas of the body in seadragons. The disease was discovered in seadragons kept in aquariums.

Experts from the Department of Pathobiology and Veterinary Science at the University of Connecticut has identified the presence of both Exophiala angulospora and an undescribed Exophiala fungus in sick seadragons.

You can find more information in the paper[1] by Nyaoke et al published in the Journal of Veterinary Diagnostic Investigation[2] in January this year.

The Leafy seadragon (Phycodurus eques) and the Weedy seadragon (Phyllopteryx taeniolatus) are both marine fish species belonging to the same family as seahorses and pipefish. The Leafy seadragon is covered in long leaf-like protrusions that serve as camouflage, while the Weedy seadragon is camouflaged by weed-like projections. Both species are native to Australian waters.

New research has revealed that the tapetail, bignose and whalefish are in fact all the same fish.

For decades, three different names have been used for three very different looking underwater creatures: the Tapetail, the Bignose and the Whalefish. A team of seven scientists*, including Smithsonian curator Dr Dave Johnson, has now discovered that these three fishes are in fact part of the same family.

After studying the body structures of the tapetails (Mirapinnidae), bignose fish (Megalomycteridae) and whalefish (Cetomimidae) and taking advantage of modern DNA-analysis, the team realized that the three are actually the larvae, male and female, respectively, of a single fish family – Cetomimidae (also known as Flabby whalefish).

“This is an incredibly significant and exciting finding,” says Johnson. “For decades scientists have wondered why all tapetails were sexually immature, all bignose fishes were males and all whalefishes were females and had no known larval stages. The answer to part of that question was right under our noses all along—the specimens of tapetails and bignose fishes that were used to describe their original families included transitional forms—we just needed to study them more carefully.”

If you wish to find out more, the article “Deep-sea mystery solved: astonishing larval transformations and extreme sexual dimorphism unite three fish families” has been published in the journal Biology Letters by the Royal Society, London.

http://publishing.royalsociety.org/

http://journals.royalsociety.org/content/g06648352k5m1562/

* The seven scientists behind the discovery are:

G.David Johnson, Division of Fishes, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA

John R. Paxton, Ichthyology, Australian Museum, Sydney, New South Wales 2010, Australia

Tracey T. Sutton, Virginia Institute of Marine Science, Gloucester Point, VA 23062, USA

Takashi P. Satoh, Marine Bioscience, Ocean Research Institute, University of Tokyo, Nakano-ku, Tokyo 164-8639, Japan

Tetsuya Sado, Zoology, Natural History Museum and Institute, Chuo-ku, Chiba 266-8682, Japan

Mutsumi Nishida, Marine Bioscience, Ocean Research Institute, University of Tokyo, Nakano-ku, Tokyo 164-8639, Japan

Masaki Miya, Zoology, Natural History Museum and Institute, Chuo-ku, Chiba 266-8682, Japan

A research group[1] studying the hunting ability of the great white shark has found evidence indicating that this notorious predator actually has a fairly weak bite. In several movies – including the legendary Spielberg film “Jaws” – the great white shark has been portrayed as a hunter blessed with an exceptionally strong bite, but the allegedly fierce jaw power of Carcharodon carcharias is now being questioned.

According to research leader Dr Daniel Huber of the University of Tampa in Florida, sharks actually have very weak jaws for their size and can bite through their prey mainly thanks to their extremely sharp teeth – and because they can grow to be so large.

Photo by Terry Goss, copyright 2006

“Pound for pound, sharks don’t bite all that hard,” says Dr Huber. Compared to mammals, sharks have amazingly weak bites for their size. Lions and tigers are for instance equipped with much more jaw strength than sharks when you account for body size. According to Huber, mammals have evolved much more efficient jaw muscles.

During the study, Dr Huber and his team studied 10 different shark species. The bites of small sharks were fairly easy to measure, while large sharks had to be knocked out and subjected to mild electricity in order to stimulate their jaw muscles.

As mentioned above, sharks don’t really need strong jaws since they can grow so large and are fitted with extraordinarily sharp teeth. In addition to this, they also benefit from having very wide jaws. When they tear an animal apart, they frequently use a sawing motion.

Dr Huber hopes that their study will lead to the development of protective swim wear and other types of shark-proofing gear.

If you wish to read more, you can find the study “Is Extreme Bite Performance Associated with Extreme Morphologies in Sharks?” in the journal Physiological and Biochemical Zoology.

http://www.journals.uchicago.edu/doi/abs/10.1086/588177?prevSearch=(shark)+AND+[journal%3A+pbz]

This post will introduce a number of new catfish species, a couple of tetras and an a few cichlid species.

Let’s start with the cichlid species. The species known as Apistogramma sp Mamore have been scientifically described by Wolfgang Staeck and Ingo Schindler and named A. erythrura. It is a small species and the largest speciemen that have been found so far was 30.8 mm SL. (just over 1.2 inch). It seems to feed on small invertebrates. Thy can be found in waters with the following conditions pH 5.2–6.4; electrical conductivity <10–20 μS/cm; total and temporary hardness < l°dH; water temperature 25.1–31.0°C. They are cave spawners and can be bred in aquariums. The male guards a territory which can contain several females. The females guard the fry.

Scientists Felipe Ottoni and Wilson Costa from Brazil have in the latest issue of the journal Vertebrate Zoology described nine new species of Australoheros cichlids from southern Brazil[1].

Australoheros autrani, A. Barbosae, A. ipatinguensis, A. macacuensis, A. muriae, A. paraibae, A.s robustus, A. saquarema

New tetras

Two new species of flag tetra have been described[2]. Both species originates in Venezuela. The new species Hyphessobrycon paucilepis and H. tuyensis was described by Carlos García-Alzate, César Román-Valencia and Donald Taphorn in the latest issue of the journal Vertebrate Zoology. At the same time they recognize three other valid species: H. diancistrus, H. fernandezi and H. sovichthys.

Hyphessobrycon paucilepis originates from the small drainages in Lara state, northern Venezuela. H. tuyensis from the Tuy River drainage in northern Venezuela

New catfish species

Brazilian scientists Héctor Alcaraz, Weferson da Graça and Oscar Shibatta have in the latest issue of the journal Neotropical Ichthyology named a new species of bumblebee catfish from Paraguay Microglanis carlae as attribute to ichthyologist Carla Pavanelli[3]. The species is found in moderately fast flowing water in Paraguay River drainage.

Brazilian ichthyologists Luisa Sarmento-Soares and Ronaldo Martins-Pinheiro have described three new Tatia species bringing the total number of described species up to twelve[4]. The three new species described are T. caxiuanensis (named after the Floresta Nacional de Caxiuanã.), T. meesi (named after Gerloff Mees) and T. nigra (named after its dark color)

T. caxiuanensis is found in the Floresta Nacional de Caxiuanã, T. meesi in Essequibo River drainage in Guyana and T. nigra in the Uatumã and Trombetas river drainages.

Marcelo Rocha, Renildo de Oliveira and Lúcia Py-Daniel have described a new Gladioglanis catfish, Gladioglanis anacanthus, which can be found in the Aripuanã River in central Brazil[5].

Lúcia Py-Daniel and Ilana Fichberg have described a new whiptail catfish, Rineloricaria daraha. This new species is found in the Rio Daráa in the Rio Negro drainage which have given the species its name[6].

A new subfamily has been created within the catfish family Loricariidae, the largest family of catfish and currently home to over 700 described species. The new subfamily has been named Otothyrinae and its members include the genera Corumbataia, Epactionotus, Eurycheilichthys, Hisonotus, Microlepidogaster, Otothyris, Otothyropsis, Parotocinclus, Pseudotothyris, and Schizolecis.

The new subfamily was named in a study published in the latest issue of the journal Molecular Phylogenetics and Evolution[1]. Juan Montoya-Burgos, Márcio Chiachio and Claudio Oliveira – the researchers behind the article – have studied the molecular phylogeny of the subfamilies Hypoptopomatinae and Neoplecostominae in the family Loricariidae. They decided to name a new subfamily after taking a closer look at the phylogeny of the fish using a partial sequence of the nuclear F-reticulon4 gene.

In addition to the nuclear F-reticulon4 gene, Burgos, Chiachio and Oliviera used morphological evidence to decide which catfish species that should be placed in the new subfamily, and the study has also examined the historical biogeography of the group.