The structure of the pharynx is also closely linked to feeding habits of fish. As indicated, the number and structure of Gill rakers may be very different — from a few small hard bumps predatory fish to a complex network of frequent rakers in silver carp — Hypophthalmichthys molitrix (Val.), litumelo planktonic algae. The mullets — Mugili – dae — muscular throat adapted for crushing lisovogo clump, consisting of detritus and vegetation. Some fish developed teeth on the pharyngeal bones. Some they are on top – and ninepatch bones, as, for example, wrasses — Labridae, or only ninepatch, as, for example, cyprinids — Cyprinidae.
Haeckel (1843) divides nizhnelomovskie teeth of cyprinid by the nature of the structure related to their function into four types:
1) hollowed — excavati, a type of Longhorn beetle,
2) chewing — mastic torii, a type of carp, Continue reading
Many aquarists aquarium catfish love for these small fish belonging to the order of catfishes of ray-finned class, not only pleasing to the eye with their cute whiskered faces, brightness and variety of colors, but these are cleaners, nurses aquariums, cleaning aquarium from the rest of the feed and its walls – from the slime, algae and other fouling.
To describe in one article all
this wonderful fish is impossible: collective term “soma” refers to over 3000 species from 36 families, of which more than 800 kept in aquariums across the world. So in this article we will cover the most common ones.
The most popular, classic type of aquarium catfish is mottled corydoras (Corydoras paleatus), which belongs to the family of armored catfishes. As this and other tetras hiding peace loving, unpretentious, active and not grow to a large size. Feed these amazing fish food left over from other fish, and live well with other species. Continue reading
The greatest length of the Black sea from North to South — 580 km and a maximum depth of 2210 m, the average — 1240 m. the salinity of the water is approximately 18 ppm. The depth increases pretty quickly. Over a sloping beach near Evpatoria, Feodosia. On the South coast, in mountain areas, the depth increases more rapidly: a few meters from the shore you have to swim (or, in the alternative, to swim along the shore). Be careful, even at a short distance from the shore can be strong currents to deal with which is not prepared person is quite difficult. But mostly this does not apply to places of mass bathing (if not to swim too far). Waters of the Black sea, as a rule, not susceptible to freezing. The average sea temperature in winter ranges from +6 to +8 degrees, in summer — from +22 to +24 degrees (can warm up to 26 degrees in a particularly hot summer). However, it is worth noting that the Black sea could throw a “surprise”: one day deep cold currents cool the coastal waters up to 12 degrees, even Continue reading