Diplostomum fish and their importance for pond culture

Advanced technology: fish Farming

Diplostomum fish and their importance for pond culture

Fish farming

Diplomacy ( Diplostomoses ) is a widely common disease of freshwater fish caused by metacercariae of trematodes of the genus Diplostomum (family Diplostomatidae , a detachment Strigeata ). Metacercariae species in this genus is a highly pathogenic fish organisms, including for fishing and pond fish. To pathogens of susceptible diplostemonous all types of freshwater and anadromous fish, especially salmon, whitefish, sturgeon, carp. They are the most dangerous for larvae, fry and fingerlings of pond fish.

Diplotaenia diseases of pond fish in Kazakhstan are observed quite often. This primarily contributes to the creation of a pond and spawning and rearing farms in the vicinity of natural water bodies, where there are persistent pockets of diplostemonous. Most natural waters is essentially a breeding ground diplostemonous infestations. The main disseminators of pathogens diplostemonous are fish-eating birds (gulls, terns, mergansers), where invasive beginning in the ponds of fish farms. If you have a large density of mollusks – mollusks creates high tension epizootic ponds farms on diplostomum that extremely negative effect on yield of stocking material and marketable fish production.

The fish in Kazakhstanuzbekistan 14 species of trematodes of the genus Diplostomum . each of which makes them independent form of the disease (table). In fish haystak epizootic importance of 8 species ( D . chromatophorum , D . helveticum , D . spathaceum , D . mergi , D . huronense , D . pusillum , D . rutili , D . nordmanni ). Of them for the health of pond fish is the most dangerous form of etiological diplostemonous “A”, “I”, “L”, “T” (see table). They are widespread in fish farms located in different regions of Kazakhstan. In the households most susceptible to the pathogens of herbivorous fish: white and motley silver carps, hybrids and carp.

In the conditions of fish farms of Kazakhstan of fish infected with pathogens diplostemonous, since the second half of may until the end of October. In the spring months of emission of cercariae from mollusks-mollusks is observed at a water temperature of 17-18°C. the Highest peak of infestation of fish by parasites in the summer months (June – August) at a temperature of 22-28°C. in Autumn, the infection of fish by cercariae has abated somewhat, but it continues in October at a water temperature of 12-14°C. Therefore, the presence of favourable environmental conditions of the aquatic environment promotes the functioning of the “pond” pockets of diplostemonous of fish under fish farms.

Table – Etiological forms of diplostemonous, their agents and the value for pond farming