QUALITATIVE COMPOSITION OF PHYTOPLANKTONS IN DIFFERENTLY MANURED CARP PONDS

Istraživanja kvalitativnog sastava fitoplanktona u različito gnojenim ribnjacima rastilištima provodena su na ribnjacarstvu »Jelas«, godine 1996. U trima rastilištima (A, B, C) uzgajan je šaranski mlađ od ličinke do dobi 56 dana uz gustoću ličinačkog nasada od 1 000 000 ind ha-1. Ličinke i mladunci prihranjivali su se trouvitom i pšeničnim brašnom. Rastilište A bilo je kontrolirano, bez gnojidbe, rastilište B gnojilo se s ukupno 200 kg ha-1 NPK (15:15:15), a rastilište C gnojilo se ukupno 75 l ha-1 UAN-a i 75 kg l-1 NP (12:52) U svim je rastilištima sličan kemizam vode. U kvalitativnom sastavu fitoplanktona utvrđene su ukupno 93 vrste, pripadnici sistematskih skupina Cyanophyta (10%), Euglenophyta (16,2%) Pyrrophyta (2%), Chrysophyta (39,4%) i Chlorophyta (32%). U svim je rastilištima utvrđen sličan kvalitativan sastav fitoplanktona uz kvocijent florne sličnosti od 65,5% do 72%.Researches on qualitative composition of phytoplanktons in differently manured fish-ponds "Jelas" were carried out in 1996. The carp fingerling from larve to its second month was nurtured in three fish-ponds (A,B,C) with the plantation of larves of 1,000,000 ind.ha-1. Larves and carp fry were nurtured by trouvit and wheat flour. The fish-pond A was controlled but not manured; the fish-pond B was fertilized by the total of 200 kg.ha-1 NPK (15:15:15) and the fish-pond C was fertilized by the total of 75 l.ha-1 of UAN and 75 kg.l-1 of NP (12:52). All fish-ponds had similar water chemism. In the qualitative composition of phytoplanktons there were stated 93 kinds, members of systematic groups Cyanophyta (10%), Euglenophyta (16.2%), Pyrrophyta (2%), Chrysophyta (39.4%) and Chlorophyta (32%). All fish-ponds had similar qualitative composition of phytoplanktons with the flora similarity quotient from 65.5% to 72%