Abstract
Romanian aquaculture can be economically sustainable and viable if the farm is profitable, the farm's income is secure, and the products are accepted by customers. In many cases, improving environmental sustainability can lead to optimizing economic sustainability. For example, a more efficient use of food and nutrients or reduced water and energy consumption are not only beneficial for the environment, but can also reduce costs. Growth in polyculture system, which represents the growth of several species of fish in the same space (pond, pool, basin, etc.), and diversification of supply can increase consumer confidence and thus economic sustainability. The diet must provide the fish with the nutrients necessary for growth (proteins with a plastic role) and provide the energy necessary for physiological processes. Quality food ensures good development, facilitates reproduction and prevents extremely harmful diseases in an aquaculture system. The paper presents a series of experimental recipes for pelletized feed made using an experimental model of small capacity. Nutrient pellets made for feeding fish from the Cyprinid family were analyzed in terms of gross energy value, ash content, moisture, mechanical durability over time, bulk density etc.
Highlights
Aquaculture, in the broadest sense of the word, means the technology of growing organisms in the aquatic environment, useful to humans, in which the predominant role belongs to fish, algae, molluscs and crustaceans
Aquaculture is currently considered as the science that deals with the study of biological bases and the development of biotechnical methods based on which aquatic organisms multiply, grow, develop in natural or anthropogenic
The results obtained for the ash content are presented in figure 4, for each feed recipe being performed 4 distinct measurements
Summary
Aquaculture, in the broadest sense of the word, means the technology of growing organisms in the aquatic environment, useful to humans, in which the predominant role belongs to fish, algae, molluscs and crustaceans. Semi-intensive growth of fish or other aquatic organisms is based on natural productivity and / or enriched by fertilization of anthropogenic ecosystems, respectively on the administration of additional food. For the aquaculture in our country, this system is widely used, contributing to obtaining food-safe products. In this case, it is obvious the intervention of anthropogenic factors to create favourable conditions for fish farming, such as: own system of supply and evacuation of water from the ecosystem (allows the replacement of 10-15% of water), application of treatments to improve physical-chemical quality of water and soil (application of organic and inorganic fertilizers, amendments, etc.) and the use of aeration systems to maintain optimal concentrations of dissolved oxygen in water, [3,4]
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