بررسی تاثیر ترکیبات نیتروژنه و درجه حرارت آب بر چسبندگی لاکتوکوکوس گارویه (Lactococcus Garviea) در بافت آبشش قزل آلای رنگین کمان در بیماری لاکتوکوکوزیس

Lactococcosis is an infectious septicemic disease in fish. in the present study ability of lactococcus garvieaeto adhere to the gill tissue of rainbow trout (oncorhynchus mykiss) was evaluated. the overall objective was to study the interaction between lactococcus garvieaeand rainbow trout during the infection process. experiments were additionally carried out to assess the influence of water quality (ammonia, nitrate) and temperature on the adhesion process of the bacterial cells. for that purpose, an applied model of experimental infections (gill perfusion model) was adopted, offering a number of advantages compared to other in vitro as well as in vivo models. bacteriological and histopathological results showed that the bacterium is capable of adhering to gill tissue and could be as a portal of entry to body of fish. it was also observed that adherence of lactococcus garvieae was affected by a number of factors. these were immersion of the gill arches in water to which ammonia and nitrate were added and elevated temperature. all of them increased the bacterial adhesion ability.