![]() With no captive breeding programs, all the specimens that were available for sale were wild-caught, and many of the small pools inhabited by the fish were rapidly becoming fished-off. So badly were numbers decimated by overfishing, that six months after the first specimens appeared in fish stores, the Pearl danio was so rare that it was feared to have become extinct. Unfortunately, thanks to enthusiastic hobbyists clamoring for specimens of these brilliantly colored, peaceful fish, numbers of Celestial Pearl danios in the wild crashed. OriginsĬelestial Pearl danios are only found in one very small area close to the city of Hopong in Burma to the east of Inle Lake, where the species remained undiscovered until 2006. The name Galaxy rasbora was given to the fish by hobbyists before the species was officially reclassified, and the popular moniker stuck. To add to the mystery, the species was originally called Celestichthys margaritatus, which translates as “heavenly fish adorned with pearls.” However, they were later reclassified and renamed Danio margaritatus. ![]() Poster coloration in surgeon fishes is apparently as important, or more, in extraspecific than intraspecific aggression, and poster-colored surgeon fishes show pronounced rapid color changes when fighting intraspecifically.Celestial Pearl danios are fish of many names!Īll those names can make matters very confusing when you come to look for the species in fish stores or online. Wickler's classification of reproductive types within the Cichlidae is shown to be no advance over the previous dichotomy of substrate and mouthbreeding species. The social systems differ radically, both when breeding and when not, and can be understood as consequences of their strategies of obtaining food. The species fall into guilds, within which there is broad overlap in diets. Most are herbivorous, with some more specialized than others. Surgeon fishes are pantropical, especially in the Pacific Ocean, and have developed distinct generic groupings within a compact family of about 75 species. The coral-reef community is one of the oldest in existence. While seemingly diverse, there is a common plan that entails the use of some or all of the same vertical bars and their central spots, and the appearance of yellow orange, red, or black ventrally. Communication is most accessible through a study of color patterns. This is counterbalanced by the need for both parents to defend the fry. There is a tendency for the generally found division of labor, with the female doing more of the direct caretaking of the eggs or fry and the male more of the defense, to lead toward polygyny. In contrast, their social behavior is remarkably conservative. Yet, they express a spectrum of feeding behavior, ranging from grazing herbivore through omnivore to predator, each of varying degrees of specialization. Despite the occurrence of about 100 species there, most are in one genus, Cichlasoma. Cichlids only recently invaded Central America. The social systems and related behavior of cichlid and surgeon fishes are compared in terms of (i) physical spacing, (ii) theoretical spacing (communication), (iii) castes, (iv) group composition, (v) open versus closed groups, and (vi) reproductive behavior.
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