The illumination of the sea. In the Black sea there is a sparkling glow due to the outbreaks of small and microscopic marine organisms (nochesvetka, peritonei) and representing a single same color sparks. The intensity increases with excitement, the passage of a vessel, etc. Sparkling luminescence is usually observed in summer and autumn. It is particularly intense in the coastal zone.
Flowering sea due to the massive accumulation of planktonic (usually vegetable, but sometimes animals) organisms in surface water. At flowering significantly reduced water clarity and change its color; water becomes yellow, brown or reddish tint. In this area the algal blooms observed mainly in the northwestern part of the sea, as well as in gulfs and bays. It is possible throughout the year, but most likely from February to may.
Algae. In the Black sea is particularly prevalent red algae — Phyllophora that forms in the northwestern part of the sea at depths of 20-60 m huge bushes. From other algae it should be noted diatoms, perogitive, blue-green and brown. In the bays, estuaries, lagoons and bays at depths of usually not more than 10-12 meters often found in the Zostera, or sea grass.
Wood borers. In the Black sea notes the destructive activity of marine borers. From bivalve molluscous meets Teredo of crustacean woodborers — limnoria and chelura.
Teredo typically destroys wood from the inside; it is directed moves along the fibers, but may be bent in a most peculiar way, intertwined with each other. With a significant defeat them, the wood becomes spongy mass. Particularly active Teredo from June to September. It is far more common off the coast of the Crimean Peninsula and the East coast.
Limnoria usually affects the wood surface. Its moves are shallow (no deeper than 5 mm, occasionally to 15 mm from the surface), but sometimes it eats away at the piles of hollows, the so-called “boilers”. Limnoria as a rule, does not tolerate turbid, stagnant, oxygen-poor water.
Chelura somewhat larger limnoria; she usually settles down next to her and drill a tree in a similar way. Moves it deeper, although the “boiler” it creates. The diameter is about 2.5 mm.
But the tree, limnoria and chelura can affect the insulation of submarine cables.
Fouling by marine organisms of an underwater part of vessels can be observed all year round, but most intensively it from may to September. Common barnacles, mussels, dracena, bryozoans, etc.
Dangerous marine animals. The spines of the dorsal fin spines and the Gill covers are very poisonous, their shots can be deadly. Great dragon lives mostly in the inlets and bays; typically it buries itself in soft soil so that only the head is visible.
European the Scorpion most often found In the Black sea predatory and venomous marine animals; they should be careful when bathing, work without diving suits, and landing troops on shore. Here dwells the barbed shark-Katran, a large dragon, the Scorpion European and European hvostokol.
Great dragon — the most dangerous fish found in bays near the rocky shores, she usually hides in the clefts of rocks or in algae. Injections of this fish is very painful.
European hvostokol, or sea cat, it lives in sheltered bays, on shallow water and in estuaries. The blows of the tail it can cause very severe and dangerous wound.
In addition, in the Black sea found a small green, red or brown jellyfish anemone. Contact causes severe skin irritation.