This is a close-up underwater scene. At the center is a large green moray eel, a long, snake-like fish with a wide mouth full of sharp, needle-like teeth. Its skin is smooth and greenish-brown, and its two round eyes look outward. Perched on the side of the eel’s face is a much smaller, brightly colored fish — the blue-banded goby. The goby has a reddish-orange head and upper body, with striking blue and black horizontal stripes running along its lower body and tail. The contrast between the massive, intimidating eel and the tiny, colorful goby creates a dramatic and fascinating image of marine life interaction. The photo captures a cleaning symbiosis. • Moray eel: A large predator that often has parasites or dead tissue around its mouth and skin. • Blue-banded goby (cleaner goby): A small reef fish that eats these parasites and dead tissue. The goby benefits by getting a reliable source of food, while the moray eel benefits by having harmful parasites removed and wounds cleaned. This is a mutualistic relationship because both species gain something positive. What’s fascinating is that during these interactions, predators like moray eels suppress their hunting instincts and allow the tiny goby to work safely, even right inside their mouths!

A #GreenMorayEel ( #GymnothoraxFunebris ) with its cleaning buddy, a #BlueBandedGoby in the Sea of Cortez

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Catalina Gobie (Lythrypnus dalli) This is a close-up underwater photograph of a Catalina goby, a tiny, vibrantly colored reef fish. The goby faces the camera with a slightly upward tilt, showcasing its brilliant orange-red body adorned with glowing neon blue stripes that trace down from its eyes and along its face. The background is warmly blurred in reddish tones, emphasizing the fish’s radiant colors. In the foreground, pieces of seaweed or encrusting marine life create a natural frame The Catalina goby are native to the eastern Pacific Ocean, particularly around California’s Channel Islands and Baja California. It is a member of the Gobiidae family and is commonly found inhabiting rocky reefs at moderate depths. Known for its bold coloration—bright red-orange with iridescent blue markings—this species often lives in crevices or among seaweeds. Catalina gobies are protogynous hermaphrodites, meaning individuals can change from female to male. They play an important role in reef ecosystems and are also popular in marine aquaria due to their striking appearance. • Protogyny is common in many reef fish species and involves sex change from female to male. • In Lythrypnus dalli, this transition typically occurs when there is a need for a dominant male to take over a territory or mating role. • Interestingly, in controlled environments, some individuals have also been observed to reverse the sex change — from male back to female — under certain social conditions. So they are bidirectional sex changers, though protogyny is the dominant pattern.

In their range, a fairly common fish. Always stunning. They all hatch female. Read more info by tapping photo.

#CatalinaGoby
#MacroMonday #LythrypnusDalli #UnderwaterMacro #MarineBiodiversity #BlueSkyMacroMonday #GobiesOfThePacific
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#ProtogynousHermaphrodites