Publications by authors named "Penka T"
Article Synopsis
- Traditional monoculture aquaculture faces issues with solid waste and nutrient use, prompting research into the bicultural farming of burbot and rainbow trout in a recirculating aquaculture system (RAS).
- The study tested different ratios of trout and burbot (T70/B30, T85/B15, T100/B0) to assess their survival rates, growth, and nutrient utilization, noting that including burbot could enhance system efficiency by consuming excess solid waste.
- Results showed high survival rates for both fish types, with optimal growth for trout in the T70/B30 group and increased phosphorus levels, but higher solid waste production in the trout-only group (T100/B0), indicating a potential benefit of mixed-species farming
Plant proteins have been increasingly used as sustainable substitutes for fish meal (FM) in aquafeeds; however, their high inclusion level compromises fish performance. The objective of this study was to examine whether yeast hydrolysate (YH) supplementation can improve the utilisation of high soybean meal (SM) diet and ameliorate its potential deteriorating impacts in pikeperch (Sander lucioperca). A basal diet was formulated using 44% FM, and four additional diets were produced by replacing 30 or 60% of FM with SM with or without the addition of 2% YH (FM, SM30, SM60, SM30 + YH, and SM60 + YH diets).
View Article and Find Full Text PDFThis study aimed to examine the ultrastructure of spermatogenic stages and mature spermatozoa in the European grayling, . The testes were examined microscopically with a transmission electron microscope to find out details of the structure and morphology of the grayling germ cells, spermatozoa and some somatic cells. The grayling testis has a tubular shape, with cysts or clusters of germ cells within seminiferous lobules.
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