First of, let me tell everyone how sorry I am that I have been posting a bit sporadic lately. Things have been crazy but hopefully they will improve even though it still might be a couple of weeks until they do. Until then you will unfortunately have to be content with the host I do manage to post. But now, without further ado, on to the Asian arowana

Asian Arowana – Scleropages formosus. Copyright www.jjphoto.dk

Bristol Zoo Gardens have bred the rare Asian Arowana (Scleropages formosus). The spawning resulted in 15 fry which are now estimated to be nine weeks old. The staff did not witness the spawning which is why they can only estimate the age of the fry for this mouth-breeding species. It is not the first time the Asian Arowanas have spawned in Bristol Zoo Gardens, but it is the first time the fry have survived.

Bristol Zoo Gardens has kept four Arowanas, also known as Dragon fish, for 13 years. They received the specimens from the UK custom services who had confiscated them after revealing an attempt to smuggle them into the country.

The zoo has recently taken steps to improve the Arowana exhibit by using reverse osmosis, and has also increased the temperature in the holding tanks. The assistant curator of the aquarium at Bristol Zoo Gardens, Jonny Rudd, believes that one of these actions might be the reason behind the successful breeding. This might very well be true but I also wish to mention the possibility that it might simply have to do with the parents getting more mature and learning from past failures, a well known phenomenon in mouth brooding fish and other fish that care for their young.

This is as far as I know the first time this species have been bred outside Asia.

The Asian Arowana is very rare in the wild and is on the brink of extinction in Thailand. It is red listed by Cites and can not be imported to many countries. This species is bred in farms in Asia where it is a popular exclusive aquarium fish, believed to bring luck due to its resemblance to a dragon. It is today available in a variety of different colorations and morphs. In Asia you can by farm bred fish with certifications stating that they are farm bred and not wild caught, and some countries allow you to import such specimens. You can read more about the Asian Arowana here.

Sri Lankan scientists have described a new species of fish from south-western Sri Lanka and placed in the genus Puntius.

Unlike its close relatives in Sri Lanka and India, the new species Puntius kelumi feature a combination of a smooth last unbranched dorsal-fin ray, a body depth that is 28.6-35.5 % of standard length (SL), maxillary barbels (about as long as the eye diameter) but no rostral barbels, 20-23 lateral-line scales on the body, and ½3/1/2½ scales in transverse line from mid-dorsum to pelvic-fin origin. One breeding males, the sides of the head and body are rough and extensively tuberculated.

Puntius kelumi is primarily found in large streams with clear water that flows down from the mountains. The bottom is typically made up by granite, pebbles and/or sand and is often littered with boulders.

The description was published by the journal Ichthyological Exploration of Freshwaters.

For more information about Puntius kelumi, see the paper: Pethiyagoda, R, A Silva, K Maduwage and M Meegaskumbura (2008) Puntius kelumi, a new species of cyprinid fish from Sri Lanka (Teleostei: Cyprinidae). Ichthyological Exploration of Freshwaters 19, pp. 201–214.

http://www.pfeil-verlag.de/04biol/pdf/ief19_3_02.pdf

A picture of the new species can be seen here

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Puntius is a genus of ray-finned fishes in the family Cyprinidae. All known members of the genus are native to Southeast Asia and India, including Sri Lanka. The name Puntius is derived from the word pungti, which is the term for small cyprinids in the Bangla (Bengali) language.

Puntius fish are commonly referred to as spotted barbs, but some species display vertical black bands instead of spots. Spotted barbs are commonly kept by aquarists and are known to be active, curious and bold. Many of them are unsuitable companions for fish with long and flowing finnage since they tend to nip such fins, a habit which causes both injury and stress in the afflicted animal.

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]

According to its keeper Barbara Woodford, 61, of Gloucester, the goldfish Ginger managed to survive for 13 hours on the floor behind a cupboard after leaping out of its bowl during the night or early in the morning.

When Woodford woke up at 7 am, she found the bowl empty and started to look for her pet, but to no avail. When it was time for her to leave for work she had still not found Ginger. When Woodward returned from work around 8 pm, she feared the worst but made a new attempt and finally managed to find her missing goldfish after moving the cupboard on which the fishbowl was standing.

“I picked him up with a spatula and his mouth started moving. I put him back into the water and off he went. He was swimming fabulously. I couldn’t believe it – it was a real Christmas miracle,” Woodward explains.

Woodward received Ginger as a birthday present in August. Recently, she had noticed how her pet was jumping up out of the water a lot. “We thought nothing of it,” says Woodward. “Apparently goldfish jump when they need more oxygen, so on this occasion he obviously jumped right out.”

A spokesman for the Association of Midland Goldfish Keepers said: “Fish can survive quite a while out of the water, as long as their gills remain moist, allowing them to breathe. But this is the longest I’ve heard of a goldfish staying alive. It’s quite astonishing.“

How can I prevent accidents like this from happening?

• Avoid keeping goldfish in bowls. A normal sized goldfish bowl is actually too small to comfortably house a fish as large and active as the goldfish.
  
• If your fish repeatedly tries to jump out of its home, try to figure out why. There are many reasons why a fish will try to jump out of its home, such as low oxygen levels, poor water quality, an aquarium or bowl that is too small, or bullying tank mates. If a fish needs to breathe air at the surface, it rarely jumps out of the aquarium – it just swims to the surface and puts its mouth above the water. Some fish species will however try to escape if the oxygen level is so low that they think they are stuck in a puddle that is gradually drying out.
  
• Some fish species are natural jumpers, e.g. because they are used to catching insects above the water in the wild or because they jump out of the water to impress a mate during courtship. Such species should always be kept in covered aquariums to prevent them from ending up on the floor.
  
• Always get a second opinion. Unfortunately, many pet shops that sell goldfish bowls, betta vases and similar have tendency to downplay the requirements of these fishes. If you are told that goldfish breathe by jumping into the air, that fish tattooed with neon-colours are doing great, or that a Siamese fighting fish in a vase need no food because it will nibble on flower roots, ask for a second opinion from someone who isn’t trying to sell you something. You can for instance visit an online forum or contact an aquarium club.
  
• If you decide to give someone a pet for their birthday, make sure that you also give them all instructions needed to care for that particular pet. Also make sure that they actually want a pet and have enough time, money and dedication to care for a living creature in the long run. A goldfish can live for 40 years or more.

A 12+ year old female reef shark kept in an aquarium at the Atlantis Resort in The Bahamas managed to jump out of its tank and onto a nearby water slide. She slid down the slide and into the swimming pool, where she was subjected to the chlorinated pool water. The aquarium staff immediately put her back in her own tank in an attempt to resuscitate her, but it was too late. The Atlantis Resort does not keep their sharks in chlorinated water; they use filtered water from the Atlantic Ocean since it is more similar to the natural environment of these animals.

According to the hotel, the shark ended up in the swimming pool after jumping over a 1 foot high and 18 in wide sustaining structure. The event took place at around 9:30 in the morning when the resorts waterscape had not yet opened for guests, so no vacationers were swimming in the pool at the time.

The Atlantis aquarists believe “the shark was startled by an unusual circumstance that we have no way of defining completely”.

Several species of shark are capable of leaping out of the water and the exact reason or reasons behind this type of behaviour are yet not fully understood. The longest sustained series of breaches ever recorded was performed by a Humpback Whale who did 130 separate leaps in less than 90 minutes in the waters around the West Indies.

A group of scientists from the Catalyst One expedition has discovered three previously unknown coral reefs 35 miles of the coast of Florida. The coral reefs consist mainly of Lophelia coral and are located at a depth of 450 metres (1475 feet).

Lophelia pertusa is a cold-water coral famous for its lack of zooxanthellae. The well known coral reefs found in warm, shallow waters – such as the Great Barrier Reef – consist of reef building corals that utilize energy from the sun by forming symbiotic relationship with photosynthesising algae. Lophelia pertusa on the other hand lives at great depths where there isn’t enough sunlight to sustain photosynthesising creatures, and survives by feeding on plankton.

The deep-sea reef habitat formed by Lophelia pertusa is important for a long row of deep water species, such as lanternfish, hatchetfish, conger eels and various molluscs, amphipods, and brittle stars. The reefs that we see today are extremely old, since Lophelia reefs typically grow no more than 1 mm per year. Unfortunately, these deep reefs are today being harmed by trawling and oil extraction.

The Catalyst One expedition will submit its newly acquired information to the South Atlantic Fisheries Management Council to provide further data for the proposed Deep Coral Habitat Area of Particular Concern (HAPC).

The Catalyst One expedition is a collaboration between the Waitt Institute for Discovery, the Harbor Branch Oceanographic Institute at Florida Atlantic University, and Woods Hole Oceanographic Institute. It combines the scientific expertise of Harbor Branch’s senior research professor, John Reed, with Woods Hole’s high-tech operations skills and Waitt Institute’s modern autonomous underwater vehicles (AUVs).

In order to reach these great depths and efficiently explore substantial areas, the expedition used REMUS 6000 AUV vehicles capable of carrying two kinds of sonar and a camera. With this type of equipment, each mission can last for up to 18 hours and provides the researchers with mosaic pictures of the bottom, pictures that can then be pieced together to form a detailed, high-definition map.

“Rarely do scientific expeditions produce solid results this quickly,” says Dr Shirley Pomponi, executive director of Harbor Branch. “This is a big win for the resource managers tasked with protecting these reefs and proof that cutting edge technology combined with the seamless teamwork of the three organisations involved in Catalyst One can accelerate the pace of discovery.”

You can find more information about the Catalyst program at the Waitt Institute for Discovery.

http://waittinstitute.org/wid/catalyst/

http://waittinstitute.org/wid/news/catalyst1.html

Scientists from three different European countries – Norway, Belgium and the UK – are now launching a new research project where the aim is to find out if cods can feel pain or not.

“Most people agree that mammals and birds can feel pain, but people are less sure about fish,” says project leader Øyvind Aas-Hansen of NOFIMA, an aquaculture research institute whose headquarters are in Tromsø, Norway.

Fish show many signs of being able to experience pain, but we still know very little about how their brains react to stimuli that would cause mammals and birds to feel pain. According to some scientists, the brain of a fish is not equipped with certain structures needed to process pain, but others believe that fish nevertheless do sense some type of pain.

What we do know is that fish show a long row of behavioural responses that could be interpreted as signs of pain, such as avoidance reactions. Fish are also capable of producing pain-relieving opiates and the fish brain is equipped with receptors for both pain and opiates.

The European researchers hope that modern medical technology, especially functional magnetic resonance imaging (fMRI) and electroencephalograms (EEGs) will make it possible for them to learn more about how the cod brain actually works. The aim of the study is to indentify which parts of the cod brain that becomes activated when a cod is exposed to potentially painful stimuli, and the researchers will also study how these signals are processed.

In order to test the brain of a fish, there is no need to expose it to any type of severe or prolonged pain; a mild stimulus that simply provokes an unpleasant sensation is enough to see how the brain reacts. “We will use the same procedures as those used on healthy human volunteers,” Dr Aas-Hansen explains.

If cods are indeed able to feel pain, Dr Aas-Hansen hopes that the results of the study will be used as yet another argument in favour of keeping aquarium fish in benevolent conditions. The study is however unlikely to affect European legislation since most regulations already assume that fish can feel pain.

Dr Aas-Hansen also points out how comparative research on how the brain works in different animals can give an insight into our own human brain. “This is ground-breaking work,” he says. “No other scientists have previously studied the cod’aquarius brain this way.”

The project will run for three years and is funded by the Norwegian Research Council.

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].

Sorry for the silence over Halloween. Posting will now hopefully return to normal with at least one post every or every other day. This first post will be somewhat of a link post catching up on some of the fishy news that happened last week.

First of is an update on the Atlantic Blue fin Tuna. Despite good signs going into the Marrakesh tuna conference the outcome was very bad with the quote for eastern blue fin tuna being set to 22,000 tons, 50 per cent higher than scientific advice. Last years quota was 29,000 tons but it is believed that a total of 61,000 tons were brought ashore when counting illegal catches. These levels are unsustainable and the blue fin tuna populations are near a collapse. You can read more about this here

Another Tuna news. A fisherman out of San Diego is believed to have caught the largest yellow fin tuna ever caught. The tuna weighed in at 381.1-pound. View a video here.

Time to stop talking about tunas and start talking about something completely different, snakeheads. A new study has shown that snakeheads are proving much less damaging to the native fauna than expected. They do not seem to be destroying populations of native fish such as largemouth and peacock bass. The scientist examined the stomach content of 127 snakeheads and found one of the most common pray to be other snakeheads. They found 13 snakeheads, one bluegill, 11 mosquitofish, seven warmouth, two peacock bass, several lizards, bufo toads, small turtles, a rat and a snake. No remains of largemouth bass were found.

Another interesting article posted this last week is this one that tells the story of the mass gharial die of that happened last winter when half the worlds population of this once common animal. Scientist finally thinks they know why this happened. Something that might help save the worlds last 100 specimens.

That is it for this time but I might post more post like this during the week if I decide that there are more news that are to important to miss.

Wild-caught pets are often recommended against, since the harvest of wild caught specimen may deplete wild populations. In the Brazilian rainforest, the harvesting of popular aquarium species such as cardinal tetras have however helped prevent deforestation and made it possible for local residents to earn a living without resorting to logging, mining, cattle ranching, and slash-and-burn agriculture.

“All this is very counter-intuitive,” says Scott Dowd, an Amazon biologist at the New England Aquarium who has been researching the dark acidic waters of Rio Negro, a major Amazon tributary in Northern Brazil, for the past two decades. “You would think biologists would not want to take fish out of the rainforest. But the fish are the key to miminizing deforestation. The people’s other economic options – timber harvest, cattle ranching and gold mining – are environmental disasters.”
The Rio Negro region has been a major fish exporter for over half a century and 60 percent of local populations rely in this source of income for their sustenance. Since deforestation is known to be detrimental to the survival of financially valuable fish species like the cardinal tetra fish, the Brazilian government has protected the Rio Negro rainforest from logging and burning – at least until now. The situation may be about to change dramatically as more and more aquarium shops switch from wild-caught fish to farm-raised specimens. Wild-caught specimens are used to the dark, soft and highly acidic water conditions of Rio Negro, while farm-raised fish tend to be acclimatized to common tap-water conditions (i.e. clear water that is not very soft or acidic) and therefore easier to keep.

To prevent the market for wild-caught Rio Negro fish from collapsing, Dowd is participating in a “Buy a Fish, Save a Tree” campaign. “The local fisheries look like they are headed for collapse”, Down explains. “But there’s hope that this threat can be addressed. If you ask fish hobbyists if they care about the environment, a very high percentage say they care about it deeply.”

Dowd hopes that the “Buy a Fish, Save a Tree” branding will help Brazilian fish harvesters to benefit from the growing trend of cause labelling, such as Fair Trade and FSC (Forest Stewardship Council).

Another important step in making wild-caught Rio Negro fish a popular alternative to farmed-raised specimens is to adapt them to normal aquarium conditions, and the New England Aquarium is therefore helping local fishermen to efficiently acclimatize wild-caught tetras to a pH-value around 7.0.

Dowd also hope to take advantage of the Internet, by assigning lot numbers to every batch of aquarium fish caught in Rio Negro. “Imagine if you could go online and see a video of the actual fisherman who caught your tropical fish, says Dowd. “I want hobbyists to know directly how their choices can affect people thousands of miles away and how they can make a contribution to saving the rainforest. Things don’t look good, but we can begin to turn all of this around.”