Summary: The most delicate stages of the sea bass and gilthead sea
bream were studied, aiming to solve and scientifically explain some of the
vital problems of the commercial production.Suitability of the new
candidates for mariculture were investigated as well as some basic
characteristic of their hybrides were studied.Finally, respons to the most
common polutants on molluscs and various fish stages have been elaborated.
The hypothezis according to which manipulation of some environmental
factors, and certain zootechnical measures (shading effect combined with
delayed feeding) could solve the problem of initial activation of
swimbladder, was confirmed. The positive impact of live food enrichment on
the growth and survival of the early developmental stages was demonstrated.
The vitamin C requirements in the daily food meal of the juvenile and
subadults gilthead sea bream has been studied. Results obtained from common
dentex studies suggest that this species can be considered as new candidate
for Mediteranean aquaculture. Crossbreading of some sparid species was
performed in order to select some hybrids with desirable characteristics.
Following such an effort, white sea bream x common dentex hybrids, and red
sea bream x common dentex were selected. A series of toxicological tests
were performed in order to investigate effects of water soluble fraction of
crude oil on fish eggs, larvae and postlarvae. Within this studies,
bioacummulation and retention of heavy metals in the body tissue of the
fish and mussells were investigated.
Research goals: Long term studies on environmental conditions and
biological factors important for survival, growth and reproduction of
commercial fish has considered as a basis for new research cycles focused
towards ecophysiological, nutritional and genetical aspect of mariculture.
The main objective of this studies was to explore some of physiological
processes related to the problem manifested as well as to upgrade
scientific knowledge needed for the improvement of culturing methods and
techniques. Number of the experiments were conducted to analyse swimbladder
malformation of sea bass larvae tending to provide critical research data
for its management porogramme. To evaluate growth and survival of some
sparide species and their hybrids, the crosbreeding programme were
introduced. Nutritional studies were performed to analyse impact of live
food enrichment on the culturing performances of the fish. Studies on the
embryogenesis and larval development provide an additional set of
information needed in the identification programme of the planctonic stages
of sparid species. Biochemical studies were undertaken to determine
gilthead sea bream ascorbic acid requirements and to get insight into
metabolism and incorporation of vitamin C into body tissue of the fish.
Studies on the bioacummulation and retention of heavy metals in mussells
were conducted to provide information needed for both, protection of
commercial production and consumers from health hasards. Response of the
early developmental stages of marine fish exposed to soluble fraction of
crude oil were investigated. The objective of this study was to predict
consequences of oil spills from coastal industrial discharges for marine