Research on the influence of physico-chemical, hydrobiological parameters and feed consumption in the context of climate change on growth performance of Cyprinus carpio, Linnaeus 1758, at the Experimental Laboratory for Agrofisheries Research in Brateș

The development of aquaculture as an economic sector has required and continues to require the introduction of new and innovative techniques and technologies, including the optimization of technological phases for feeding target species. Carp (Cyprinus carpio Linnaeus, 1758) represents one of the most important culture species with high economic value.  In order to optimize the technological phase of fish feeding, specifically for carp (Cyprinus carpio Linnaeus, 1758), under controlled aquaculture conditions, the main physicochemical parameters (water temperature, dissolved oxygen, pH, nitrites, nitrates, ammonia, etc.) and hydrobiological parameters (phytoplankton and zooplankton) are assessed to ensure that they fall within appropriate limits based on the specific requirements of the species and its age. During a 90-day experiment, the research highlighted the correlation between physicochemical and hydrobiological parameters and the food consumption of the carp species (Cyprinus carpio, Linnaeus, 1758). For the purpose of conducting the research, a total of 355 specimens of carp (summer I) raised in the growth ponds of the Experimental Laboratory for Agrofisheries Research in Brateș were used as biological material. Monitoring of all parameters was carried out from April to June 2024. The methods for determining the main physicochemical parameters (water temperature, dissolved oxygen, pH, nitrites, nitrates, ammonia, etc.) and hydrobiological parameters (phytoplankton and zooplankton) were specific methods described in the scientific literature. The feed used in the experiment consisted of granulated feed with a crude protein content of 27%. It was highlighted that at temperatures exceeding 25 °C, the best feed consumption index was recorded. The lowest feed consumption index was observed at a water temperature of 18.5 °C in April, while the highest level of the consumption index was noted in August at a water temperature of 26.7 °C.