Impact of the species ratio in polyculture on growth and weight of bivalve mollusks in the Tauiskaya Guba Bay, Okhotsk Sea

Abstract

Linear growth and weight of bivalve mollusks cultivated in polyculture are considered. Cages with three mollusk species, as blue mussel, long-necked clam (mya), and macoma, were hanged at the depth of 1.0–1.5 m in the Tauiskaya Guba Bay, Okhotsk Sea. Several sets of these species with ratio mussel : mya : macoma 30 : 35 : 35, 50 : 25 : 25 and 70 : 15 : 15 were tested in the period from June 15 to October 26. The species ratio of 30 : 35 : 35 and 50 : 25 : 25 provided the highest linear increments for mussels (7.4 ± 0.3 and 7.1 ± 0.5 mm, respectively) and the highest weight increments for mya (7.8–8.2 g). The species ratio of 70 : 15 : 15 was the most favorable for weight growth of macoma (weight increments 1.6 ± 0.1 g). Mussels were distinguished by the largest elimination among all species in the polyculture — 7.5–8.8 %, whereas losses of macoma were the lowest — 1.9–2.1 %. The polyculture is considered as a prospective approach for bivalve mollusks cultivation in the northern Okhotsk Sea.

Keywords

• мидии
• мии
• макомы
• скорость роста моллюсков
• культивирование
• поликультур
• подвесные садки
• различная пропорция видов