Diet of coelenterates
Algae or coelenterates (for example, jellyfish) trapped underneath bathing suits usually cause a rash that results from irritation. The fish eat sponges and algae that grow around their rocky homes as well as small animals such as tubeworms, nudibranchs and bryozoans. Each March, males work feverishly to tidy their nest areas, by removing debris, carrying away sea stars or urchins that wander along, and biting away all the plant growth except for a few species of red algae. They signal their interest by swimming with their fins sticking straight up. These vividly colored fish are extremely territorial, and have even been known to charge our aquarists. Females are reluctant to lay their eggs in an empty nest—they look for a nest with eggs from at least one other female (and up to 20 females). Males try to entice these females over by swimming loops with their bright orange bodies. Most algae and coelenterates cannot be seen by the naked eye, so exposures to them are usually accidental. Much of the work of raising babies is handled by the male. Seaweed such as algae and coelenterates are found worldwide in salt water and fresh water and can cause skin irritation.
Females are very choosy, often visiting 15 nests or more before making up their minds. However, the seaweed rash usually occurs when swimmers have direct contact with Lyngbya majuscula seaweed when it gets under bathing suits or in areas where skin to skin contact occurs such as under the breasts or in the groin region. When to Seek Medical Care for Seaweed Irritation. Garibaldis are round, plump fish with flowing pectoral and tail fins, and staring yellow eyes. Beginning in April and lasting until fall, females ready to lay eggs make outings to look for good nests. Their diet of sponges may contribute to their bright colors. Sometimes it is difficult to distinguish between seaweed and coelenterate-caused skin irritation. Up to 40 garibaldis, and their territories, can exist within an area the size of a basketball court. They get much of their food by grazing on algae or sponges growing in the exhibit, occasionally joining the feeding frenzy when a diver offers krill during an afternoon feeding show. If she takes notice, he swims straight over to his nest, hoping she will follow. Juvenile garibaldis are deeper orange, with sparkling spots of blue and blue-trimmed fins. Upon becoming an adult, a male garibaldi picks out a promising stretch of reef—a sheltering nook plus a smooth expanse of rock wall—where he will live for the rest of his life. They occur as far north as Monterey Bay but are especially common in the warmer waters of Southern California and the Channel Islands.
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