The Sea Anemone

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Whatever your degree of participation in this hobby, you will continue to find new challenges to spark your interest, capture your imagination, and stimulate your creative abilities. Wherever your particular field of interest may lie, you will always find in this hobby of ours, the wonders and beauties of life's creations.

All of us, as aquarium hobbyists, maintain our aquariums primarily for the aesthetic pleasure we derive from them. The scope of the hobby need be no wider than this simple pleasure and enjoyment. However, many are stimulated to study one or more particular facets of a specialized field such as ethnology, genetics, biology, or one of the other scientific pursuits. Whatever we do - however far we may travel in this hobby - we must always be concerned with conservation. Our primary goal should always be to return to nature something in return for the pleasures and benefits we have received. We should always remember to try to learn as much as possible and to record that information, not only for our own use, but for the benefit of others. We should learn to breed the species of fish we maintain so that we do not wantonly endanger the creatures of the rivers, lakes, and oceans by wantonly reducing their numbers until they are in danger of extinction.

We have the right to enjoy the life forms in our aquarium, but we have an obligation and a responsibility to sustain, protect, and conserve those creatures from which we have derived so much enjoyment."

When you think of your fish as a pet you'll agree, they deserve the best care an attention you can provide. A healthy aquarium is relatively easy to achieve and maintain, but it will not happen by itself... it depends on you.


Choosing Your Next Anemone

Many hobbyist's first attempt at keeping marine fish involves the keeping of clownfish. Most are colorful, they have an interesting swimming motion, they are inexpensive and they are relatively hardy. Soon after the purchase of their clownfish many of those same people decide that their clownfish need an anemone. This is where many aquarist meet with their first failure. They find that even given good water conditions and good lighting their anemone still dies six to eight months later for no apparent reason. If the anemone does live, they may find they have a healthy clownfish and a beautiful anemone and neither one will have anything to do with the other. In this article I hope to give you some information that will help you to avoid these problems.

This information was gathered from over 30 aquarists like yourselves (some of them relatively famous) who have responded to my questions via the Internet (a worldwide computer network which has bulletin board services where aquarium related questions can by posted and answered), every clownfish host anemone book or scientific article I could get my hands on (and there aren't very many on keeping anemones out there), and Aquarists in charge of the tropical tanks at several public aquariums. When discussing the anemones I will give the scientific name first and then as many common names as I can before the information. (please understand that until recently not even the scientific names had been standardized) I don't mean to imply that my information is highly scientific; 30 people is hardly a good sampling. Hopefully those of you reading this article will be inspired to send me your experiences even if to tell me that you have had the same experiences.

Possible Clownfish/Anemone combinations

The Changing Drag Coefficients of Sea Anemones

(Condylactus giganticus) in Response to Various Flow Rates.

Proper care of the live sea anemone specimens have to be met in order to assure anemones in good conditions. The holding tank is where the sea anemones reside. It requires a specific gravity of 1.21, a pH of 8.2-8.4, and a temperature of 78-80F. The anemones also require filtered and flowing water to help eliminate wastes, and a constant source of light. It has been shown that light has a direct relationship with lipid content in the anemone's tissues indicating that sufficient light leads to a healthy anemone (Harland et al, 1992). The light should give 3 to 5 watts per gallon of water. The lights should also be 50 % actinic and 50% full spectrums (Henderson, 1996). The flow tank also requires the same conditions as the holding tank but it does not need a light source since the sea anemone is only held there temporarily for testing. Finally, the anemones must be fed brine shrimp approximately three times a week (Henderson, 1996).

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FIELD GUIDE TO ANEMONE FISHES AND THEIR HOST SEA ANEMONES

The symbiosis between clownfishes and sea anemones fascinates diver and biologist alike for many of the same reasons. The sea anemones that play host to the fishes are, like most of their kin, virtually immovably fixed. Each anemone constitutes the territory of its fish, which therefore seldom venture far from it, retreating into its tentacles when feeling threatened. This sedentariness, which so intrigued Dr. Collingwood, allows biologists to do long-term studies, revisiting the same animals repeatedly. Underwater enthusiasts, having once found them, can be assured of relocating fish and anemones on future dives. The fish can be approached very closely, and both partners are extremely beautiful, making them a prime subject of photographers.

GEOGRAPHICAL AND ECOLOGICAL DISTRIBUTION

Sea anemones live throughout the world's oceans, from poles to equator, and from the deepest trenches to the shores, as do fishes. But no one kind of either lives in all places. Of nearly 1000 species of sea anemones, only 10 are host to anemonefishes. They live in the parts of the Indian and Pacific Oceans that lie within the tropics or where warm, tropical waters are carried by currents, such as the east coast of Japan (as far north as the latitude of Tokyo!). Because the 28 species of clownfishes live only with these 10 species of sea anemones, they are found in the same places.

"From the time you set up that first 10 gallon community tank it becomes a part of your life. And, as you progress in this hobby - as you grow, experience, and learn - it becomes a way of life.

Perhaps that 10 gallon community tank will be enough to satisfy your interests. Perhaps you will decide to specialize in one particular species of fish - learning everything you can possibly learn about that species, and attempt to breed them. Perhaps you will maintain a larger aquarium  or even get into the marine aquarium. "

When most of us started keeping aquariums, we went into the hobby blind. We read outdated books and listened to the self-serving advice from our local fish shops. Only after the death of many aquatic animals and the purchase of expensive, useless equipment did we accumulate the knowledge and skills necessary to successfully keep these creatures. As with anything, there are those who are in it purely for profit, with little regard for the environment. These people range from the collectors who still use cyanide to catch fish, even though it shortens the fish's life, to the retailers who will sell anything to anyone, no questions asked. Looking back on those years of “trial and error” aquarium keeping, I’ve often wondered why someone never guided people through the setup and maintenance of aquariums. Well, finally someone has.M

The Aquarium Club pages are much more than a place to see and learn about aquatic life. Our focus is on raising people's awareness of the environment through information and Internet links. Many hours are devoted to this website. The cost is extremely high to set up and to maintain the sixty plus sites that we operate. We have over two hundred members which depend on our help to maintain their aquariums. The club fees and the help of the members is extremely important to insure the work we are doing. Free advice is just that, it has little or no value.

Our interest extends beyond these pages, to promoting conservation and aquaculture research projects worldwide-from helping understand environmental changes, to saving the endangered reefs, and endangered species with captive bred freshwater and marine life.

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The Sea Anemone

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THE ANEMONES

Sea anemones live throughout the world's oceans, from poles to equator, and from the deepest trenches to the shores, as do fishes. But no one kind of either lives in all places. Of nearly 1000 species of sea anemones, only 10 are host to anemone fishes. They live in the parts of the Indian and Pacific Oceans that lie within the tropics or where warm, tropical waters are carried by currents, such as the east coast of Japan (as far north as the latitude of Tokyo!). Because the 28 species of clownfishes live only with these 10 species of sea anemones, they are found in the same places.

Sea anemones are invertebrates, or animals lacking backbones, in contrast with fishes, which are vertebrates. Over 95% of all the kinds of animals in the world are invertebrates, most of them insects.

Primitive animals, anemones belong to the phylum variously known as Cnidaria (with a silent "c") or Coelenterata ("se-len-ter-a'-ta"). The former name alludes to the cnidae, or nematocysts, that are manufactured by all members of this phylum, and only by them. The latter means "hollow gut," referring to the single body cavity that serves as stomach, lung, intestine, circulatory system, and everything else. There is but one opening (the mouth) into this cavity, through which all water, food, and gametes pass in and out. It is surrounded by few or many tentacles, which are finger-like or filamentous projections, typically studded with nematocysts. They are active in capturing food and transferring it to the mouth, and may be used defensively, too.

Members of Class Anthozoa (which also includes hard and soft corals), sea anemones live attached to firm objects, generally the sea floor, or embedded in its sediments. An anemone's mouth points generally away from the substratum, and is surrounded by relatively short tentacles. Unlike most other anthozoans, sea anemones lack skeletons of any sort and are solitary. Anthozoans such as corals commonly exist as colonies, with many anemone-like individuals attached to one another. Each cylindrical individual is called a polyp. Members of the other three cnidarian classes may exist as polyps, but additionally (or exclusively) as medusae (singular is medusa). A medusa is little more than an upside- down polyp lacking a skeleton, free to swim in the open sea, with somewhat lengthened tentacles -- in short, a jellyfish.

The Sea Anemones

by Evan McNamara

The Cnidaria Phylum

A Greek word "cnidos" means "stinging nettle", which created this phylum's name. The defining characteristic of this phylum is their nematocysts or the stinging tentacles. When attacked or hungry the Cnidarians inject their tentacle into the prey or predator. Often they inject a barbed thread and often some kind of poison. Their "bag-shaped" body with only one mouth, no anus, is surrounded by tentacles with nematocysts. The layers of the organisms include two layers of cells; ectoderm (an outer layer) and one inner layer called the endoderm. There is also a jelly like substance, between the two main inner and outer layers, called mesogloea. Jellyfish, another organism in the Cnidaria Phylum, differs from the Sea Anemones because the Jellyfish are free floating (called medusae), while the Sea Anemones are attached to a rock or the ocean floor (called polyps).

Underwater Field Guide to Ross Island & McMurdo Sound, Antarctica

CNIDARIA

sea anemones, soft coral, hydroids, jellyfish

Click on each organism to view more information


Anemones are invertebrates, as are 95% of the earth's creatures. Most invertebrates are insects. The name Cnidaria (with a silent "c") refers to the cnidae, or nematocysts, which all Cnidarians have. The phylum Cnidaria includes anemones, corals, jellyfish, and hydras. The 'cnidae' are the stinging cells which provide the animals a means of capturing prey and/or defending themselves with a painful sting. Another name for Cnidarians is Coelenterata (pronounced "se-len-ter-a'-ta') which refers to the single body cavity that serves as stomach, lung, intestine, and everything else! There is only one opening into this cavity, the mouth, through which everything passes in and out. The mouth is surrounded by several or many tentacles which contain the nematocysts (cnidae) at their tips. Sea anemones, being members of the Class Anthozoa, along with hard and soft corals, are benthic, which means they are attached to rocks or the sea floor. Anemones in the aquarium though, will often move around until they find a place that they like and then stay put!

Sea Anemone

Discovery School: Sea Anemone

Sea anemone, is a sea animal that looks like a flower called the anemone. The shape of the animal's body and its bright color give the sea anemone a plantlike appearance. Its body may be blue, green, pink, red, or a combination of colors.

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Possible Clownfish/Anemone combinations

Phylum: Cnidaria

Class: Anthozoa

Order: Actiniaria

A sea anemone usually attaches itself to rocks or coral. They have a central mouth which is surrounded by tentacles with nematocysts, stinging cells that paralyze and entangle small marine animals. Sea anemones primarily reproduce sexually: most often, their eggs are fertilized in the gastric cavity, and then their young are released through the mouth temporarily as free-swimming larvae--they soon find somewhere to attach themselves to. A few sea anemones have symbiotic relationships with some hermit crabs; they attach themselves on the shell of the hermit crab (or they are attached by the hermit crab). There are theories that this is beneficial to the hermit crab for protection since the stinging cells on certain sea anemones can be quite potent, and the sea anemone may benefit from scraps of the hermit crab's food that it did not eat. They are the relatives of corals and sea fans. They exist only in the polyp stage and obtain their food by filter feeding.

Common Name: Crimson anemone; Scientific Name: Cribrinopsis fernaldi

Facts: Reaching large sizes of about 18 in, the color of this anemone can range from red to pale yellow or white. It is found in many different habitats in both high and low current.

Anemones are classified in phylum Cnidaria,

Which includes all that have nematocysts (stinging cells used for defense, capturing food, etc.). Today's talk will center on the anemonefish host anemones, which are concentrated in family Actiniidae and Stichodacylidae.

Anemones can basically be thought of as water-filled tissue sacs with tentacles on top and a flat base on bottom

The cylindrical main body is basically at the mercy of the exterior environment, which is one of the reasons that anemones suffer more from osmotic stresses than fish do.

Birth of a reef tank

Starting a Saltwater tank.

The AquariumDoctor

Breeding The Clownfish

Breeding Marine Fish and Invertebrate

Breeding Saltwater Fish

Marine Aquarium Fish Families

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GLOSSARY

This is contribution number 66 of the Christensen Research Institute, Madang, Papua New Guinea. A generous grant from the Christensen Fund gave us the impetus to begin this project, which we had been discussing for a decade. We also acknowledge with gratitude the Director and Board of Trustees of the Western Australian Museum for making the publication of this book possible.

The sea anemone is considered to be the flower of the sea.

Sea anemones look like plants, but they are really meat-eating animals. Sea anemones come in different sizes and many different colors.

The sea anemone can attach itself to rocks or coral. In the center of the sea anemone is their mouth. In order for the sea anemone to eat, they must wait for their food to swim by. Then they sting it with their tentacles, and then push it into their mouth.

Sea anemones spend most of their lives in one place. They can attach themselves to rocks. Some even bury themselves in the mud.

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