Showing posts with label lionfish. Show all posts
Showing posts with label lionfish. Show all posts

2017-10-27

LIONFISHES - Scorpaenidae Family

Regalia
Lionfish * Firefish - Photo   by      Bob Owen
Members of this family are known commonly as Firefish, Scorpionfish, Rockfish, Stonefish, or Lionfish (amongst others). They belong to the order Scorpaeniformes, which includes 35 families, 300 genera, and more than 1,000 species. They are important both in the marine aquarium trade and as food (those of us fish-eaters living on the west coast are familiar with "Pacific Snapper" which is not a snapper at all-it's from the family Scorpaenidae). Fishes from the family Scorpaenidae are widely distributed throughout the oceans of the world (temperate and tropical), but the so-called lionfishes which are of the most interest to the marine hobbyist are indigenous to the tropical Indo-Pacific (although they have now established themselves along the eastern seaboard of the United States).

The species most often seen in the home aquarium are from the subfamily Pteroinae and the genera Brachypterois, Pterois and Dendrochirus. Of these three genera, the genus Pterois are the true lionfishes while the species in the other genera are generally referred to in the hobby as the dwarf lionfishes. Specimens from the genus Brachypterois are rarely seen in the hobby. All species of the subfamily Pteroinae are hearty, dramatic-looking and very capable of causing the lackadaisical aquarist a whole world of hurt through their powerful sting. Nonetheless, the potential of being stung is far outweighed in most hobbyists' minds by the positive attributes of the extraordinary lionfish.

The lionfishes from the genus Pterois get their name from the Greek word "pteron" which translates to "wing." Indeed, a large Pterois in open water-pectoral fins outstretched-is very much like a winged creature. Add to this display the rearing dorsal fin, and you can clearly see why this fish with a mane is commonly called a lionfish. The most recognizable species in the industry is the Red Lionfish (P. volitans). This impressive fish (not to be confused with P. lunulata or the Luna Lion, which is often sold as a red volitans) has earned its way onto the stamps of at least eight countries and into thousands of marine aquaria. Growing up to a foot and a half in length, these are very impressive animals.

The Red Lionfish, it should be noted, is not always red, and as such, members of the same species should not be confused based on dramatic color differences alone. Red Lionfish living in estuaries can be almost entirely black while those that inhabit outer reefs down to 55 meters may be much brighter in color. Generally nocturnal, the Red Lionfish in the wild spends its days upside down in a cave or head down in a rock crevice. When hunting, it uses its large pectoral fins to corral its prey (small fish and invertebrates such as shrimp and crabs) before stinging and consuming it. In captivity, the Red Lionfish is, in many ways, an aquarist's dream. Provided with the right captive habitat and diet, this fish will be long-lived and the center of attention for anyone viewing your aquarium.




The other two genera of lionfish are generally thought of as the dwarf lionfish. They seldom exceed six inches in length. As already mentioned, specimens from the genus Brachypterois are rarely seen in the hobby, but dwarf lionfish from the genus Dendrochirus are quite common. In many ways, dwarf lionfish possess all the appeal of their larger kin, just in a smaller size. Although the dwarfs tend to be somewhat more sedentary and stick closer to the bottom of the tank, they can be kept in tanks half the size of those required for a Red Lionfish. Of the dwarfs one might consider, the Zebra Turkeyfish (Dendrochirus zebra) is always a favorite and relatively common. Many hobbyists swear that the less common Fuzzy Dwarf (Dendrochirus brachypterus) is the most "personable" of all lionfish.

Despite their differences in size, the true lionfish and the dwarf lionfish have similar captive habitat requirements (except, of course, for minimum tank size). Lionfish have a reputation as being remarkably hearty fish (second only to damsels some say), and while this is true, some care should be taken to provide lionfish with an environment that meets their species-specific needs. Because lionfish are nocturnal, they will not appreciate tanks that are brightly lit with metal halides unless there are places in the tank that remain heavily shaded. From the lionfish's perspective, even a relatively dark refuge in a tank illuminated by metal halides is inferior to a tank lit by low illumination fluorescents. More than one captive lionfish has been permanently damaged by being blinded by lights that are too bright.

Lionfish are not known to be particularly territorial and will share their cave or another place of refuge with members of their own species or other lionfish species. Having said this, keep in mind that recommended stocking densities for true lionfish are about 40 gallons per lionfish (and about half that for the dwarfs). In terms of water chemistry, while lionfish will appreciate stability in the system, they are remarkably resilient and can survive dismal water conditions (although this obviously should not be the goal). Lionfish do make a mess, and as a result, excellent mechanical/biological filtration and protein skimming are essential. Without appropriate filtration, a dive in alkaline reserve is likely to be accompanied by plunging pH necessitating a massive emergency water change. All this, of course, can be avoided by appropriate filtration, excellent protein skimming, and regular water changes.



Everyone knows when you go to the zoo not to feed the lions. If everyone kept the same in mind with their lionfish, far fewer would die in captivity each year. The reason you don't feed the lions at the zoo is that they are already being fed a healthy, appropriate diet by their keepers, and while there are those who may love to show off their lionfish snacking on live goldfish, this is really not in the best interest of the animal. It is true that some lionfish will not readily accept a captive diet (in which case it may be necessary to offer the specimen a live shrimp, small fish or crab at first), but the goal should always be to try to get the fish eating a captive diet. One technique that works well is the feed your new lionfish live feeder shrimp mixed with frozen mysis shrimp. Over time (days to weeks depending on the individual fish), increase the frozen mysis shrimp and decrease the live feeder shrimp until you have cut out the live food entirely. Eventually, lionfish should accept a captive diet including fresh or frozen foods such as krill, shrimp, silversides, and various prepared foods. Once the lionfish is settled in, offer food on a feeding stick, but don't force the issue. Feeding one to three times a week should be sufficient. Keep in mind that lionfish will eat smaller fishes, ornamental shrimps and crabs in your system, and remember that their mouths can open to leviathan proportions.

It is not uncommon to see some fin rot due to handling during the shipping process, and this is easily taken care of with furan compounds. Copper treatments are highly effective with lionfish suffering from protozoal infections like Cryptocaryon. "Coughing" or "shaking" disease is something you will experience with lionfish, but it's actually not a disease at all. This is a common behavior and aids in the shedding of skin (necessary to purge algae and sessile invertebrates that have attached themselves to the fish). In short, it is a perfectly normal part of life for many of these fishes.

At the beginning of the article, it was cautioned that lionfishes are capable of a powerful sting. This is true and something of which any aquarist should be aware before purchasing one. Lionfish are not poisonous, as if often stated-remember, many species in the family Scorpaenidae are important food sources. Instead, they are venomous meaning that they deliver their venom or toxin through injection (not ingestion). Lionfish have venom sacs connected to their spines, and while there have been reports of some individuals aggressively "charging" the hobbyist's hand when in the tank, most stings are the result of careless contact while cleaning the tank or handling the fish. If you are stung (either by an alive or dead specimen), it will most likely be painful and, although rarely fatal, it is possible to have a very severe reaction necessitating the attention of a physician. In most cases, however, expect a reaction like a bee sting. If you experience more serious signs and symptoms including, but not limited to, shortness of breath, nausea, and fever seek medical attention immediately.

In conclusion, while there is some risk in choosing to keep lionfish from the family Scorpaenidae, most hobbyists agree that the good far outweighs the bad. These incredible "winged fish" are almost inconceivable in their delicate beauty. The fact that a fish so exotic-looking and interesting is also relatively easy to acquire, hearty and long-lived is the proverbial icing on the cake.

    By Ret Talbot
    2008 (C) Blue Zoo Aquatics
    Blue Zoo Aquatics was formed in 2001 as a custom aquarium design, manufacture, installation, and maintenance company which provided its services in and around Los Angeles, California. The company founders and key personnel had either a background in marine biology or had spent their entire career in the saltwater aquarium industry.
    Customers who bought a custom aquarium were also frequently asking us to provide livestock and aquarium supplies, so we created bluezooaquatics.com to showcase our entire product offering and make it available to everyone.
    Today, Blue Zoo Aquatics has evolved into the complete source for all of your aquarium needs. Although we can still design and build you a beautiful custom aquarium, we are also proud to offer one of the largest selections of livestock on the web as well as a wide variety of quality aquarium supplies.
    Our business has expanded, but Blue Zoo is still owned and operated by the same team of expert aquarists that have dedicated their lives to helping people have fun and succeed with saltwater aquariums. - http://www.bluezooaquatics.com
    Article Source: EzineArticles



2017-07-19

Tips on LIONFISH Care

Lionfish or volitans are venomous fish belonging to the family Scorpaenidae whose literal translation means scorpion fish. There are five genera and 16 individual species commonly referred to as lionfish. Their natural habitant is among the reefs and rocky crevices of the Indo-Pacific and the Red Sea. This species is not native to warmer tropical regions of the world. Recently established populations are present in the Eastern Atlantic, the Caribbean and the Mediterranean Seas.

Lion Fish
Lion Fish (Photo credit: Wikipedia)

They are becoming more and more common place off the Florida coastline. Scientists speculate that these species were first introduced when a public aquarium was destroyed in southern Florida by Hurricane Andrew, a Category 5 hurricane in 1992. DNA analysis from captured fish supports this theory. All newly established populations originated from the same seven fish. The continued non-indigenous prorogation of this species has created concern among ecologists. It is yet to be determined what kind of human and environmental dangers these creatures will pose in their new breeding grounds.

The lionfish is inarguably one of the more exotic creatures you will ever see in a home aquarium. They are one of the most prized fish in the aquarium trade. There are 11 species from two distinct genera (Pterois and Dendrochris) readily available to home aquarists. The Dendriochirus lionfish's fins form a solid fan with individual fin rays held together by a connective membrane. Pterois lionfish have long flowing fin rays that are individually sheathed by the membrane.

The fins on a Pterois extend well past their tail. There is one species of lionfish, the Pterois sphex, which resides only in the waters off the shorelines of the Hawaiian Islands. Regardless of the species everything about these fish, from its regal fanned main to its cantankerous demeanor, says, "You don't want to mess with me." This fish is also marketed under the aquarium trade names turkey fish, dragon fish, scorpion and fire fish.



All lionfish have distinctive fins as well as fin and body striping. Color palettes and size are particular to species. Dwarf lion fish only reach an adult length of 5-6 inches and can be kept in an aquarium as small as 30 gallons. Other species can grow to in excess of 15 inches and will require a 75-100 gallon tank. These are among the most poisonous creatures found in the ocean and should only be kept by expert aquarists.

Lionfish are voracious predators. There are very few species in the wild that would even consider harassing one more or less attempting to eat it. Strangely enough, their venomous fins are not used for the purpose of predation. They rely on their natural camouflaging and split-second reflexes for hunting. Lionfish capture their prey by boxing it in with their large fins and then swallowing it whole. Their venom is used strictly as a means of defense. When threatened the lionfish will lunge at its opponent with its up to 18 needle-like dorsal spines erect and ready to neutralize the aggressor.

Due to its predatory and venomous nature lionfish are best suited for a mono-species or multiple lionfish species tank. You can keep more than one in an aquarium. You will want to take the fish's current and potential adult size into consideration. Lionfish have been known to prey on one another.

Lion fish are carnivorous. Smaller fish can be fed frozen carnivorous marine food products. They will also readily eat brine shrimp. Larger fish should be fed feeder shrimp or small fish. Although not generally marketed for consumption, lionfish are considered a culinary delicacy in some regions of the world.

    By Stephen J Broy
    Technological advancements in the aquarium industry continually redefine the concept of "home aquarium ownership." Just twenty years ago not even the biggest public aquarium was capable of keeping jellyfish alive in captivity. Now they make desktop Jellyfish Fish Tank Aquariums. And why would you want a jellyfish tank? Perhaps you should check out what the translucent bodies of Pet Moon Jellyfish look like under LED lighting. Pet Jellyfish give a whole new meaning to the term exotic pets.

    Article Source: EzineArticles