The circumstance of winter disease phenomenon in intensively reared sea bream (Sparus aurata L.) has been described. It’s occurence in Mediterranean has been registered and reported by several authors. The aim of this paper is to contribute to the comprehension on the aethiology of this syndrome which is causing significant losses in one year old cultured fish. Different types of commercial diets were introduced during 1994/95 rearing season to the sea bream reared in floating cages. The feeds were displaying differences in energetic compound level and vitamin A, D3 and E content. Health difficulties and mortality in the observed fish groups at the beginning of the problem, did not indicate any biotic agent as being responsible for such condition. Clinical features and mortality in the groups affected by winter disease syndrome were increasing by low sea temperature and correlating with feeding period by food containing low levels of protein, lipids and vitamins.
Pathological findings were in particularly related to the organs involved in digestion. Growth rate was characteristic for the group that were suffering winter disease, where increasing in length was not followed by body weight. Clinical signs, simptomathology related to the organs involved in digestion, liver histology analyses, weight losses and pattern of weight and length relation, correlation between used feeds and occurrence of winter disease, implicated nutrition as one of most possible ethiological agent of this condition.
Nutritional interventions applied contributed in comprehension of the winter disease syndrome.
The relationship between nutritional requirements, particularly regerding autumn-winter period, has been researched and analyzed. The results approved our basic hypothesis.Opisane su okolnosti u kojima se pojavila zimska bolest u intenzivno uzgajane podlanice (Sparus aurata L). Nekoliko je autora ustanovilo i izvijestilo o njezinoj pojavi u zemljama Sredozemlja. Svrha je ovoga rada da pridonese razumijevanju etiologije ovoga sindroma koji uzrokuje značajne gubitke jednogodišnje ribe. Različite vrste komercijalnih hrana uvedene su u hranidbu intenzivno uzgajane podlanice u sezoni 1994/95. Hrane su se razlikovale uenergijskoj jačini i količini vitamina A, D3 i. Početkom zdravstvenih poteškoća i uginuća promatranih grupa riba ništa nije upućivalo na uzročnika biotske etiologije. Klinički znakovi i uginuća u grupama riba na koje je djelovala zimska bolest povećavali su se padom temperature mora i bili su u vezi s razdobljem u kojem je hrana sadržavala malu količinu bjelančevina, masti i vitamina. Patološki su se nalazi poglavito odnosili na organe koji sudjeluju u probavi. Prirast je bio karakterističan za grupu koja je oboljela od zimske bolesti, pri čemu povećanje u dužinu nije pratio i porast tjelesne težine. Klinički znakovi, simptomatologija probavnih organa, histološki nalazi jetre, gubitak biomase, obrazac odnosa težine i dužine, povezanost upotrijebljenih hrana i pojave zimske bolesti, upozoravaju na hranidbu kao najvjerojatniji etiološki uzročnik opisane pojave.
Intervencije u hranidbi koje smo upotrijebili pomogle su u razumijevanju pojave sindroma zimske bolesti. Odnos između hranidbenih potreba, osobito u jesensko-zimskom razdoblju, proučavan je i analiziran. Rezultati su potvrdili našu osnovnu pretpostavku
