That being said, individual cells can not only sense and react to environmental stimuli but communicate with other cells. In a lot of ways, sponges are really just a big pile of loosely associated cells. In fact, overall, their cells are so unspecialized that they lack (at least in the opinion of some biologists) true tissues. These very primitive creatures are so simple in structure that they really are a lot more like colonies than distinct organisms. Of all animals, sponges (Phylum Porifera) are most closely related to the colonial choanoflagellates that are the progenitors of the animal kingdom. To address this concern, it may be helpful to understand the basic anatomy of these “animals” and how they feed. But the biggest longstanding concern for captive sponges is nutrition. air exposure) dooms an otherwise healthy specimen before it even reaches a retailer. Other reasons are not always so obvious too often, improper harvesting/handling practices (e.g. For example, a single pomacanthid angelfish can consume a large sponge in a matter of days. Sometimes, it’s as simple as bad pairing. This low success rate is attributable to several things. Despite their sometimes stunning beauty, they are unusual to aquarists for one reason: They have a really, really bad record of survivability in captivity. If anything, they are rather poorly represented in the aquarium hobby. Indeed, they are found in great abundance and diversity on most coral reefs. Sponges, at least as a group, are not rare in any way. These developments will surely result in a much greater selection and availability of “oddball” aquarium livestock in coming years.
Many marine creatures (especially filter-feeding invertebrates like sponges) that were once deemed difficult or even impossible to keep are now cultured with regularity. Much of this owes to progress in the area of foods and feeding. Coral reef aquaria, and the science of maintaining them, have advanced by leaps and bounds in the last decade.
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