Algal symbiosis

The symbiosis with photosynthetic dinoflagellates called zooxanthellae in certain species of anemones gives them a "built-in" source of food. These zooxanthellae are microscopic round golden brown single-celled organisms that live in the cells of the tentacles and oral disc of the anemone. The clownfish host anemones all possess zooxanthellae, as do most of the species covered in this book. Therefore they require light of sufficient intensity and spectral quality in order to maintain this symbiotic relationship and to survive (see chapter 8). The relationship between anemones and their symbiotic zooxanthellae is similar to the relationships between corals and zooxanthellae or tridacnid clams and zooxanthellae (see discussion in volume one). The dinoflagellates leak the products of photosynthesis (oxygen, sugars, and amino acids) to

Zooxanthellae Products

their host and in tum take in some of the dissolved products of respiration and digestion (carbon dioxide and ammonia) from their host.

Anemones can regulate the amount of light they receive by expanding or contracting the oral disc, or by withdrawing into the sand or a crevice in the rocks. Some anemones have gravel

The COMPLETE guide to Aquariums

The COMPLETE guide to Aquariums

The word aquarium originates from the ancient Latin language, aqua meaning water and the suffix rium meaning place or building. Aquariums are beautiful and look good anywhere! Home aquariums are becoming more and more popular, it is a hobby that many people are flocking too and fish shops are on the rise. Fish are generally easy to keep although do they need quite a bit of attention. Puppies and kittens were the typical pet but now fish are becoming more and more frequent in house holds. In recent years fish shops have noticed a great increase in the rise of people wanting to purchase aquariums and fish, the boom has been great for local shops as the fish industry hasnt been such a great industry before now.

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