That Fish Blog – Aquarium Advice and Information

How can something be so beautiful and yet so dangerous and destructive? Invasive lionfish are making headlines again, continuing their viral spread in the Atlantic and decimating native species as they explode in population. Lionfish are quickly becoming the poster species for the horrible things that can happen when a non-native species is introduced to a new region or habitat, left without predators to keep populations in check.

This isn’t a new story, just a continuing saga conveying the sad consequences of accidental or intentional introduction of non-native species. The story is believed to have begun sometime in the 80’s with lionfish being sighted between Florida and the Caribbean. Within 15-20 years the population exploded and at this point any hope of stopping the invasion has all but fizzled.  No one will ever know how they were introduced or where to place the blame. Some believe careless aquarists are at fault, releasing the fish into waterways if they became to large or otherwise unable to be kept. One popular theory is that the fish made their way into the Atlantic after a coastal hurricane destroyed a home or homes with aquariums that contained the Indo-Pacific natives, which miraculously found their way safely into east coast waters. Others believe it’s possible that juvenile or larval lions hitched a ride in ship ballast waters as other species have before, finding themselves in a new world when the waters were pumped out. Regardless, lions are here and here to stay, with only we humans as their predators. Read More »

Fishes are the most numerous and diverse of all vertebrates, so it’s no surprise that many fascinating new species were discovered in 2012.  Among them were 9 brilliantly-colored American Darters and a Vietnamese fish that carries its sexual organs on its head (dubbed, for the lack of a better name, the Genitalia-Headed Fish).  Shallow Tennessee streams, ocean trenches nearly 2 miles deep, Indonesian coral reefs and many other habitats yielded wonderful surprises, and hinted that fish enthusiasts have much more to look forward to. Today I’ll highlight a few grabbed my attention; please post your own favorites (whether covered here or not) below.

US Darters: the Obama Fish and other “Politicos”

Nine new species of freshwater Darter were described from the southeastern USA this past year (Bulletin of the Alabama Museum of Natural History).  Five were named in honor of the environmental awareness exhibited by current and former politicians: Etheostoma obama, E. teddyroosevelt, E. gore, E. jimmycarter and E. Clinton. Read More »

Hello, Frank Indiviglio here.  October, 2012’s Hurricane Sandy wrecked havoc on fish keepers and public aquariums in the Northeastern USA.  My own collection, which houses several 20-30 year-old catfishes, loaches and aquatic amphibians, suffered only a single loss.  I owe a debt of gratitude to the dedicated folks at That Fish Place-That Pet Place, who shipped much-needed supplies to me in record time, despite the disastrous weather.  The public aquariums for which I consult are now working frantically to limit losses; I’ll provide updates via Twitter.

Most aquarists know what steps to take during power outages, so today I’d like to focus on several points that, in my experience, are sometimes over-looked.

Filter Care and Bacteria Die-offs

When power fails, submersible, corner, and other internal filters should be removed from the aquarium.  When oxygenated water is flowing through a filter, waste material is processed by beneficial aerobic bacteria, and ammonia is converted to less toxic nitrites and nitrates (please see this article).  Once the flow of water stops, the resident beneficial bacteria perish.  Without aerobic bacteria, your filter becomes a source of decomposing organic material, quickly poisoning the already-stressed aquarium inhabitants.

As the contents of external aquarium filters are not in direct contact with the water, they will not immediately add to the pollution problem.  However, these filters should be disconnected because when electric power is restored, they will pump ammonia and other toxins into the tank. Read More »

Maintaining proper aquarium temperatures is essential for the health and well-being of your fish. While aquarium heaters do a pretty good job at this, the probability of fluctuations from fall through spring tends to be greater and possibly more detrimental. You may not even realize how much the temperature of the water changes through the day or day-to-day until you’re faced with ich or some other problem in your aquarium.

The Threat of Cool Temperatures

While our aquarium fish will rarely if ever be exposed to near or below freezing temperatures in the safety of your home (hopefully), fish farmers in Florida can attest to the immediate and lingering problems that can come with even short exposure to cold temps. Exposure to temps below 60 F can create chaos in a tropical tank, so you can imagine what freezing temps do to tropical fish housed in an outdoor setting. Sensitive fish may be killed outright from the shock of extreme temperatures or fluctuations in temperatures. Others face blows to their immune systems and the increased chance of being infected by opportunistic parasites, fungi or bacteria. These organisms take advantage at the slightest sign of stress on the part of tropical fish, and can decimate the population in a short amount of time. Cooler temperatures tend to make normally active fish lethargic and slower to react, making them more open to predation if outdoors. Similar problems can occur in the aquarium if smaller or more sensitive fish are not able to hide or escape the curiosity of larger, hardier tankmates.  Read More »

A few days ago, I came across a curious story in the aquatic news feed regarding fatalities of local swimmers/fishermen in Papua New Guinea. Though the reported fatalities occurred in 2001, the unusual events drew famous monster fish angler Jeremy Wade to Oceania to investigate and nab one of the possible culprits.

There were apparently two fatalities in 2001 during which the two men had their genitalia bitten off as they pursued their aquatic activities. Both bled to death (these were two seperate occasions) after being bitten by a mysterious, human-like predator in a remote area. As it turns out, the culprit was a large Red-bellied Pacu. Read More »