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Hitchhikers Guide - Lionfish Lair

Nudibranchs that feed on hydroids can store the hydroids' (stinging cells) in the bodywall, the . Thenematocysts wander through the without harming the nudibranch. Once further into the organ, thecells are brought to the specific placements on the creature's hindbody via intestinal protuberances. Nudibranches can protectthemselves from the hydroids and their nematocysts. It is not yetclear how, but special cells with large probably play an important role. Theycan also take in plants' chloroplasts (plant cell organelles usedfor photosynthesis) and use them to make food for themselves. Ithas been shown that some nudibranch species such as can survive on nothing but the energy derivedfrom photosynthesis.

The Cerata of Phylodesmius nudibranchs also produce food through photosynthesis.

Nudibranch range
Fast Facts
Type: Invertebrate
Diet: Carnivore
Average lifespan in the wild: Up to 1 year
Size: 0.25 to 12 in (6 mm to 31 cm)
Weight: Up to 3.3 lbs (1.5 kg)
Did you know? Some nudibranchs are solar-powered, storing algae in their outer tissues and living off the sugars produced by the algae’s photosynthesis.

Red-lipped batfish | Strange Animals

Studies On a Nudibranch That Contains Zooxanthellae .1. Photosynthesis, Respiration and the Translocation of Newly Fixed Carbon by Zooxanthellae in Pteraeolidia-Ianthina

Cerata - The Cerata can contain nematocysts absorbed while feeding on hydroids. These nematocysts cells are stored within the Cerata and fire off with the slightest touch, defending the slug against would-be predators in the same fashion as a stinging jellyfish. The Cerata also function similarly as the gills on a Dorid and can be very colorful. The Cerata of Phylodesmius nudibranchs also produce food through photosynthesis.

Photosynthetic invertebrates (many corals, anemones, clams, nudibranch, etc.) also need more blue (400-490nm) than "higher" plants especially as tanks increase in depth, such as the 465-485 blue spectrum. Not only is blue/actinic lighting beneficial to photosynthetic invertebrates, it is also aesthetically pleasing to the eye and the 420 nm blue in particular brings out the colors of many corals/clams.
Osram Oslon now has a "patent pending" LED emitter (the NP Blue) that is the first 'blue' emitter SPECIFICALLY designed for the full PAR spectrum required by marine photosynthetic invertebrates (see for more)

Full text of "NEW" - Internet Archive

nudibranchs are solar-powered, storing algae in their outer tissues and living off the sugars produced by the algae’s photosynthesis

Aiptasia is a genus of a symbiotic cnidarian belonging to the class Anthozoa (sea anemones, corals)
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