The Cuckoo Wrasse (Labrus mixtus) is a protogynous hermaphrodite, and females can change sex into males, a process which takes around seven months. In this short and interesting video you can observe the phase in which a female has just begun the transformation to become a male: in fact the electric blue color and the darker bands are starting to become evident, but have not yet covered the body as in the phase of complete transformation. The cuckoo wrasse is a species of wrasse native to the eastern Atlantic Ocean from Norway to Senegal, including the Azores and Madeira. It is also found in the Mediterranean Sea.

Mediterranean jellyfish, Cotylorhiza tuberculata, is a species of jellyfish, of the phylum Cnidaria, also known as the Mediterranean jelly. It is commonly found in the Mediterranean Sea, Aegean Sea, and Adriatic Sea. It can reach 40 cm in diameter. It seems that this jellyfish's sting has very little or no effect on humans.

In this video you can see a Titan Triggerfish in its juvenile phase during which, if possible, it tries to stay safe inside a lair that it has probably excavated. However, if it catches signs of danger, it runs away to find a safer refuge in the coral reef. The shape is characteristic of triggerfishes, but the light color is far from the adult stage.

I saw this beautiful specimen of Umbaculum mediterraneum during a dive in a Mediterranean coral reef at a depth of over 70 meters. In many years of diving I had never come across this nudibranch. It is an adult specimen of rather large dimensions, in fact it is well over 20 cm in length. This leads me to think that, together with Aplysia depilans, it is among the largest nudibranchs present in the Mediterranean Sea.

Barrel jellyfish is a very beautiful jellyfish! and this one in the video is really big, probably the diameter exceeds 50/55 cm, as can be seen from the proportions of the undersigned's hand. It is one of the classic jellyfish of the Mediterranean Sea, perhaps the most common to encounter. Here on intotheblue.it we have published it numerous times.

The history of the Italian motor ship Tabarka tells us how many of the wounds caused by the Second World War are unfortunately still open. The Tabarka was part of a convoy of seven ships that left Livorno and headed for Corsica, which headed south, south/west to get around some minefields present in the waters off Livorno and the Secche di Vada area.

The Orange-lined Triggerfish has a dark brown to dark green body with orange lines that start behind the head and cover the rest of its body. Their maximum body size is about 30 centimeters. Its body has a stocky appearance, oval shape, and is compressed laterally. The head is large and is about one third of the body length. The mouth is small and terminal and it has strong teeth.

The Garfish (Belone belone) has a very elongated and compressed body, the dorsal zone is dark blue and fades in the blue on the flanks which are silvery; The belly is yellowish in color. Its length can exceed 80 cm and 1 Kg of weight. The jaws are thin and prominent enough to resemble a beak. The Garfish is a pelagic fish that lives on the high seas, only during the summer it approaches the coast to spawn.