That Fish Blog – Aquarium Advice and Information

Hello, Frank Indiviglio here.

I have always looked to public aquariums and botanical gardens for inspiration in my own work.  I have visited koi ponds in many places, including some of the famed beauties in Kyoto, Japan (I plan an article on these shortly), but my favorite is, oddly enough, located in the heart of Brooklyn, NY. 

Koi and Cherry Blossoms

The 52-acre Brooklyn Botanical Gardens, opened in 1910, houses a huge, spectacular pond, home to some of the largest and oldest koi to be found anywhere.  The surrounding grounds are planted with 42 varieties of cherry trees, all of which bloom in April and May…seeing this spectacle in combination with schools of colorful koi is an experience of a lifetime (the garden hosts the largest cherry blossom festival, or Sakura Matsuri, to be found outside of Japan).

A rainy spring day many years ago granted me my first look at a koi breeding frenzy…I had previously observed hundreds of carp spawning in the Bronx River, and was suitably impressed (some of these lunkers topped 40 pounds in weight!) but the roiling, colorful koi put their drab ancestors to shame.

An Urban Legend Revealed

I was first drawn to BBG in search of the huge soft-shelled turtles which were said to inhabit the koi pond.  Less cynical than most of my fellow New Yorkers, I had since childhood followed up on any and all reports of urban wildlife, however fanciful.  I had some pleasant discoveries – copperhead snakes did indeed live under the George Washington Bridge and sturgeon still swim the East River, and some disappointments – Flushing Meadow’s “lungfishes” turned out to be American eels.

I found 135 red-eared sliders and several snapping turtles in the pond, but the soft shells eluded me for decades.  Then, while having lunch near the pond (I was working at the nearby Prospect Park Zoo at the time) I spied two huge spiny soft-shelled turtles (Apalone spinifera) basking on a small island.  They remain the largest I’ve ever seen (fish a favorite food!), and must have been living there for upwards of 50 years.  Although native to New York State, spiny soft-shells are quite rare here, and never seen anywhere near NYC. 

Piranha, Osprey and Other Visitors

I enjoy visiting areas that serve as retreats for urban wildlife, and have had many wonderful surprises along the way.  BBG is an important resting place for migrating birds, with over 200 species having been recorded.  The koi pond also yields some surprising visitors from time to time – including “transplanted” bass, sunfish, eels and red-bellied piranha!

Ospreys have made a major comeback in the USA, and are now seen quite near New York and other coastal cities.  Last spring a pair under camera surveillance in Norwalk, CT (The Maritime Aquarium) were regularly observed to bring quite large (and expensive!) koi to their chicks…I’m sure it’s just a matter of time until these huge “fish hawks” visit Brooklyn! 

 Further Reading

You can learn more about the Brooklyn Botanical Garden’s koi pond and amazing plant collection (10,000 species at last count) at http://www.bbg.org/.

Please write in with your questions and comments.  Thanks, until next time, Frank Indiviglio.

In 1988 a small crab showed up on the New Jersey shore, apparently discharged there along with bilge water from ships that had visited the Western Pacific.  Deceptively innocuous, by the mid 1990’s the Asian shore crab (Hemigrapsus sanguineus) was the dominant inter-tidal crab in an area stretching from Maine to North Carolina. In the space of 3-5 years, it became the most common crab at several estuaries that I visit…at one, hermit crabs and sand shrimp have virtually disappeared.

Asian shore crabs seem to co-exist more peaceably with one another than do native species…those pictured here were found under a single small rock.  I wonder if, in contrast to other crabs, newly-molted individuals are not attacked by neighbors. 

Making the Most of an Invader

There is, however, a silver lining to this environmental cloud…the crabs make a nutritious addition to the diets of many aquarium fishes and invertebrates.  Many fishes consume small crabs whole, and they can be broken up for smaller fishes.  Freshwater fishes ranging in size from guppies to peacock bass will enjoy an occasional crab meal as well.

Shore crabs thrive for weeks in damp seaweed under refrigeration and can be frozen for future use.

Collecting Crabs and other Marine Animals

Asian shore crabs inhabit tide-pools, jetties and salt marshes.  They forage as the tide recedes and are most easily collected at low tide, when they shelter below rocks and other cover.  A wide variety of sizes (please see photo), suitable for nearly any size aquatic pet, can be gathered in no time at all.

While searching for shore crabs, keep your eyes open for shrimps, worms, mussels and other small creatures.  All are useful aquarium foods, and many make very interesting display animals (shore crabs are unprotected, but check local regulations regarding others).

An Unusual Visitor from the South

Seining and setting out minnow traps will improve your catch, and the sea never fails to provide wonderful surprises.  Last summer an inshore lizardfish (Synodus foetens) showed up in my net (please see photo).  I’ve had only limited success with them in captivity and so released this one after taking some photos.

Shore Crabs in the Aquarium

As is my way, I tried my hand at keeping Asian shore crabs in captivity, and was pleasantly surprised.  Although in nature foraging is tied to the tidal cycle, captives abandon this strategy and soon appear at all hours (in contrast, native fiddler crabs that I have kept became active according to an internal clock – feeding and retiring in groups, despite the absence of a tidal influence).  Shore crabs feed ravenously on any and all plant or animal based fish foods.

I set up a group in a large estuary exhibit at the Brooklyn Children’s Museum, and they have done quite well there.  The crabs forage underwater and on rocks protruding above the surface, and co-exist with sand shrimp, striped killifish and other natives (in a small aquarium, they should be monitored closely for aggression).

Crab Alternatives

Please check out our extensive selection of frozen and freeze-dried  fish foods.  Many contain whole marine animals, and are an excellent addition to the diets of aquarium fishes and invertebrates.

Further Reading

Information about this and other introduced marine animals and plants is posted at http://www.seagrant.uconn.edu/INVID.HTM.

Please write in with your questions and comments. Thanks, until next time, Frank Indiviglio.

Hi, Eileen here. There are a lot of different terms and phrases, used in reference to saltwater and freshwater aquariums alike, that may be unfamiliar to some aquarists or that you might come across in books, magazines or your local fish store like That Fish Place/ That Pet Place. I thought it might be beneficial to place a glossary of common terms as a reference. Here are some of the most common terms used in the aquarium trade that may be confusing to someone just starting out or beginning to explore the hobby. Keep in mind that they may have different meanings or may be used differently depending on the region or the aquarist you may be speaking to.

Biological terms:

• Barbel: the “whiskers” or whisker-like appendages around the face and mouth of some fish.
• Benthic: Benthic organisms live on, in, or attached to the bottom. These organisms include corals, crabs, starfish, cucumbers and worms.
• Breeding styles: There are several different breeding styles common in aquarium fish and invertebrates.
  • Livebearer: Livebearers give birth to live young that are fully or nearly fully formed and often resemble miniature adults. Guppies, swordtails and seahorses are a few well-known livebearers.
  • Mouthbrooder: Mouthbrooders hold their eggs and eventually their young in their mouths until the young are ready to live on their own. The parent holding the young often does not eat during this time. Some cichlids and saltwater cardinalfish are mouthbrooders.
  • Egg–layer: This is the breeding style that most people are familiar with. The female fish will lay a clutch of eggs and the male will fertilize the eggs after they are released. Most parents will guard their eggs during this time. Freshwater angelfish and saltwater clownfish are common egg-layers.
  • Egg–scatterer: Egg-scatterers show little to no parental care for their young and will randomly scatterer the eggs across the substrate or vegetation. They often may eat their eggs and fry if not removed from the site. Tetras, danios, and rasboras are all egg-scatterers.
  • Bubble–nesting: Gouramis and bettas are well-known bubble-nesters. The male will build a ring or nest of bubbles at the surface of the tank or plants and will defend other fish, including the female who laid the eggs, from getting close to the next.
  • Egg–burying: Annual fish like killifish will bury their eggs in muddy substrate in the wild where they remain dormant throughout the dry season and until the next rainy season. These fish are typically short-lived and only have a lifespan of one or two seasons.
• Cichlid: Cichlids (pronounced SICK-lids) are a group of fish known for being some of the most aggressive and territorial. They are native to distinct regions and many species have limited range. Cichlids are generally divided into “Old World” and “New World” groups.
  • Old World Cichlids: These cichlids are those found generally in the eastern hemisphere, most notably the African Cichlids found in the African Rift Lakes Lake Malawi, Lake Tanganyika and Lake Victoria basin. This group also includes West African, Madagascar and Asian cichlids. These are typically found in very specific water conditions and should not usually be mixed with other more docile tropical fish.
  • New World Cichlids: These are also collectively referred to as South and Central American cichlids but may also include some found in southern North America. Many are large and aggressive, but there are also dwarf species and some that are rather docile.
• Coral: Coral refers to a very large group of invertebrates in the family Cnidaria. They are very widespread in appearance, habitat, requirements and lifestyle, but are only found in saltwater environments. This group can further be dividing into LPS, SPS, and Soft Corals.
  • Large Polyp Stony Corals (LPS): These corals have hard skeletons covered with fleshy tissue that often can make the coral look like a plant or anemone. These corals are found in a variety of environments and are often not as sensitive as their SPS cousins. They feed through a combination of photosynthesis from algae in their tissue and filter feeding from the water column. This is not technically a scientific classification, but is used by hobbyists as a convenient way of dividing corals.
  • Small Polyp Stony Corals (SPS): These corals have a more rigid appearance with very small polyps or thin tissue covering their skeletons. They live primarily on reefs and most get the majority of their nutrition from the algae in their tissue. These corals are very popular amongst hobbyists for propogation and “fragging”. Again, like LPS corals, this is not an official scientific classification.
  • Soft Corals: Also known as leather corals, the vast majority of these do not have a rigid skeleton, though there are a few exceptions, like Heliopora. They filter-feed or absorb most of their nutrition from the water and can live in a wide range of water conditions.
• Crustaceans: Crustaceans are a group of invertebrates characterized by their insect-like appearance, hard exoskeleton that they must “molt” or shed to grow, and segmented bodies. Common aquarium crustaceans are shrimp, crabs and lobsters.
• Cyanobacteria: Cyanobacteria (“cyano” or “slime algae”) is a bacteria commonly mistaken for algae and can be green, brown, red, black or blue. It is considered an aquarium nuisance and usually will bloom when water quality or lighting is poor. It is most common in saltwater aquariums, but can also be found in freshwater aquariums at times.
• Diet: Diet refers to what an animal will normally eat in the wild. Five main diet or feeding types are common in aquarium:
  • Herbivore: Herbivores eat plants and plant matter almost exclusively.
  • Carnivore: Carnivores are meat-eaters and feed on very little plant matter.
  • Omnivore: Omnivores eat both plants and animals in their nature diet. Some may eat more plants than meat or vice versa.
  • Planktivore: Plantkivores feed on very small plants and animals in the water column. They may actively search out this food or may filter feed by sifting through the water column and feeding on whatever they find there.
• Photosynthesis: Some invertebrates have algae known as zooxanthallae living in their tissue which produces proteins through photosynthesis. The animal then feeds off of the by-product of these symbiotic algae.
  • Diurnal: Diurnal organisms are active primarily during the day or in daylight.
• Fin types: Each fin and body region on a fish is named and the common or scientific name of the fish may refer to markings on or around these fins. Knowing the names of the fins can also help in identifying fish or diseases. Not all of these fins are found on every fish and there are several other minor fins found in some groups.
  • Dorsal: The dorsal fin runs along the back and spine of the fish. The dorsal side of the fish also refers to this top half or the region around its back. This fin is used to help stabilize the fish while swimming.
  • Pectoral: Pectoral refers to the chest of the fish or the fins on either side of the body just behind the gills. These fins are used mostly in steering the fish, but also help to propel it through the water.
  • Peduncal: The peduncal or caudal peduncle is the narrow area between the main body of the fish and the tail.
  • Pelvic: Pelvic fins are paired and are found under the pectoral fins on the lower part or “belly” of the fish. They are used to help stop or turn the fish and to move vertically through the water column. Some fish like gobies have fused pelvic fins that act like a suction cup and help fix the fish onto a surface.
  • Anal: This fin is located on the bottom of the fish just in front of the tail. It is also used to help stabilize the fish. In male livebearers, this fin is modified into the pointed gonopodium and is used to fertilize the female.
• Invertebrate: An invertebrate is any animal without a backbone. This group includes snails, shrimp, crabs, corals, octopuses, clams, starfish, urchins and many more animals.
• Lateral Line: The Lateral Line is a sensory organ found primarily in fish. The Lateral Line can be seen as a groove running the length of the body on most fish and is used to detect movement in the water, even from great distances. Schooling behaviors and the quick movement and reflexes seen in some fish are thought to be related to this organ. Some fish can be identified by markings around the Lateral Line and some diseases like Head and Lateral Line Erosion (HLLE) are associated with it as well.
• Nematocyst: Nematocysts are stinging cells found in the invertebrate phylum Cnidaria (anemones, jellyfish, corals and other invertebrates). The cell is “spring-loaded” – when the trigger is activated, the cell springs open and injects a harpoon-like projection into the target. This is a defense in most animals but some fish like jellyfish use this as a passive way to catch and disable their prey.
• Nocturnal: Nocturnal organisms are active primarily at night.
• Operculum: Operculum is Latin for “little lid”. In fish, this is the bony plate that covers the gills. In snails, this is the hard trapdoor that protects that snail when it retracts into its shell.
• Plankton: Plankton and planktonic organisms do not swim against the flow of the water but rather travel with the flow. Most plankton is very tiny and is a primary food of filter-feeding organisms like corals and feather dusters, but other planktonic organisms like jellyfish and even the very large Ocean Sunfish can be much larger in size.
• Photoperiod: The photoperiod is the length of day and night an organisms is exposed to and their reaction to it. An improper photoperiod can affect the health and activity of aquarium fish, invertebrates and plants.
• Photosynthesis: Photosynthesis is the process by which a plant (including algae) uses carbon dioxide and sunlight to produce organics like sugars and gives off oxygen as a by-product. Some bacteria like cyanobacteria also use photosynthesis.
• Scales: Most fish are covered with rigid scales for protection. These scales vary with the type of fish. Fish like sharks have scales also known as “dermal denticles” for their tooth-like structure. Other fish have scales with either a smooth outer edge (cycloid), or scales with a serrated edge (ctenoid).
• Scientific name: The scientific name of an organism is the name assigned to it by scientists and taxonomists to be used as the “official” and universal name for that organism. In contrast, the common name can vary between countries, languages, regions and from aquarist to aquarists. Scientific names are typically written in italics while common names are often written with quotation marks.
• Sexual Dimorphism: Sexually dimorphic animals have physical characteristics that differentiate between males and females of the same species. The difference can be subtle (a specific marking or size difference) or very obvious (completely different coloration).
• Venomous: A venomous organism injects a toxin into its prey, either as a defense or as a way to disable their prey. This differs from poisonous organisms whose toxin must be ingested or absorbed.
• Zooxanthallae: These tiny algae cells live within the tissue of other organisms like corals and anemones. The larger animals or colony provides the zooxanthallae with a host and the zooxanthallae provides the host animal with energy from photosynthesis. A coral may “bleach” or eject all of the zooxanthallae from its tissue if stressed, often resulting in the death of the coral.

I’ll be back with some other terms that may be useful for those who are new to the hobby in future posts!

Hey  Everyone!  Patty here.  Thought I’d take a minute to highlight some of the new and interesting things we’ve gotten in this week in the fish room.  With the Anniversary Sale coming this week, I’m sure there will be more to see and buzz about for the weekend, but here is a look at just a couple of the newest arrivals that are looking particularly pretty.  All of the regular favorites will be here for the sale along with some special goodies that will make the visit even more worthwhile!  We hope you can make it in this weekend!
Freshwater

Lake Tebera Rainbow
Like other Rainbowfish, this species is great for larger community aquariums. They are larger, but active and peaceful. Rainbowfish are also great additions for their shimmering colors.

Small blood parrot
This batch came to us with more natural looking coloration instead of the traditional brightly colored Bloody Parrots.

Lelupi
Lelupi are a staple in the world of African Cichlids, sought after for their interesting habits as well as their bright yellow-orange coloration. These are lovely!

Gold faced datnoid
Datnoids have a mystique about them that is quite a draw. This species has attractive bars and a golden sheen in the head and face. Enthusiasts should check these out!

Saltwater

Yasha haze
The Yasha Haze Goby has been around in the market for a few years now, but every time one arrives it’s beauty still astounds me. This is a great candidate for a reef or nano-reef system.

Orange-spotted Sea Slug
This pretty slug is a real spectacle! A Pacific native, its bright orange dots make it easy to spot.

Swissguard
Despite is rather cryptic, cave-dwelling personality, Swiss Guards and other related basslets like the Swales Swiss Guard (also here) have amazing color and will not disappoint in the right environment. They are most at home in a rocky reef home.

Feel free to contact our livestock department or a fishroom associate if you are looking for anything in particular before you come in or if you are interested in having something live shipped to your door.

Hi Dave here,

I thought it was about time to post an update to the blog about the 700 gallon reef tank here at TFP. The tank is really starting to mature nicely, and we have seen some really nice growth from the corals in the tank.

For all the particulars of the tank, refer back to the original blog, the details of the tank, lighting, and filtration are discussed in detail. No need to rehash them here.

The tank has been running for about a year now, and things have gone very well. I wanted to post a few new pics of the tank so that you can see the changes since then. We have added a few new items into the tank since the original blog back in August of 2008. The majority of the corals that we put into the tank, originated from captive sources, or frags from our own propagation system, it has been really cool to watch them fill in and grow into larger colonies.

If anyone has any questions about the tank, please ask, I would be happy to explain what I can.

Until next blog
Dave