Issues:
Sections:
Issue 93
GENERAL BIOLOGY
UDK: 597.554.3:574.622
TO THE STUDY OF THE NUTRITION OF THE COMMON RUDD (SCARDINIUS ERYTHROPHTHALMUS) OF THE SAMUR COAST OF THE CASPIAN SEA
KHLOPKOVA Marina Vladimirovna,
GASANOVA Aysha Sharapatinovna,
GUSEYNOV Kais Magomedovich,
BARKHALOV Ruslan Magomedovich
The results of studying the size and weight indicators, fatness (according to Fulton), fertility, seasonal changes in the gonads (gonadal maturity index) and nutrition (food lump content and occurrence of the forage organisms) of the common rudd (Scardinius erythrophthalmus) on the Samur coast of the Caspian Sea are presented. The collection and processing of ichthyological material were carried out according to the generally accepted ichthyological methods. It was found that the common rudd had a wide age range - an increase in the number of fish of older age categories (5 and older), high size and weight indicators, growth rate, fatness, favorable sex ratio (predominance of females) and good replenishment. It was found that with the growth and development of germ cells and gonads respectively, the accumulation of nutrients in them, an increase in the gonadosomatic index is observed. Moreover, the maximum increase in this indicator occurs at the IV and V stages of the gonad maturity. The composition of the food lump of the fish of all size groups included insect larvae, algae and worms. No fish with empty intestines were found. In general, favorable conditions have developed in the waters of the Samur coast of the Caspian Sea for the natural habitat of the common rudd.
Pages: 12 - 17
Date: 28.06.2024