hrvatski

Alge kao promotori rasta hidri u akvakulturi

Zelena hidra (Hydra viridissima Pallas, 1766) i smeđa hidra (Hydra oligactis Pallas, 1766) ili obje vrste zajedno izlagane su herbicidu norflurazonu koncentracija 2x10-7 i 2x10-6 mol/L. Dio hidri izložen je sinergističkom djelovanju norflurazona i UVB-zračenja valne duljine 254 nm tijekom 2 minute. Hidrama su dodane monokulture slobodnoživuće alge Chlorella vulgaris (CV) i endosimbiotske alge Mychonastes homosphaera (CZ10) ili suspenzija obje vrste zajedno. Pokus je u istim uvjetima izveden i bez dodatka algi. Praćeno je nespolno razmnožavanje (pupanje) hidri tijekom tri dana. U hidra s dodatkom algi nespolno razmnožavanje je bilo puno jače izraženo. Smeđa hidra je pupala u većem postotku od zelene hidre, izložena različitim tretmanima. Nespolno razmnožavanje je bio najveće trećeg dana, kada je pupalo i do 100% jedinki smeđe hidre. Bez dodatka algi hidre su se nespolno razmnožavale u puno manjem postotku. Time je ukazana uloga algi kao potencijalnih pojačivača/promotora nespolnog razmnožavanja hidri u akvakulturi. Green hydra (Hydra viridissima Pallas, 1766) and brown hydra (Hydra oligactis Pallas, 1766), either separately or both species together were treated with 2x10-7 and 2x10-6 mol/L of aqueous solution of herbicide norflurazon. Hydras were also exposed to synergistic treatment with norflurazon and UVB-radiation (λ=254 nm, 2 min). Monocultures of free-living alga Chlorella vulgaris (CV) and endosymbiotic alga Mychonastes homosphaera (CZ10) were added to the experimental dishes, either separatately or suspension of both species together. The experiment was also performed in the same experimental conditions without algal suspensions. Asexual reproduction (budding) of hydras was monitored for three days. In the samples with the addition of algae budding was extremely expressed. Brown hydra reproduced asexually more often when compared with green hydra, in different tested conditions. The largest percentage of asexual reproduction was present on the third day with up to 100% in brown hydras. Hydras without algal suspensions asexually reproduced in a much lower percentage. Algae proved to be potential promotors/enhancers of asexual reproduction of hydras in aquaculture.

alge, hidra, nespolno razmnožavanje, akvakultura

abstract je i na engleskom jeziku