The Water Disinfection with Different Type UV Lamp Systems on Bacterial Load in Small Scale Recirculating Aquaculture Systems

The present study was planned with the aim of inactivating the total bacterial load and species in tilapia fish tanks kept in fresh and seawater conditions with high stock density with different UV lamp models. In this context, the UVC+UVA-Led lamp system was compared with the conventional UVC lamp system and the total bacterial load in the tanks and the inactivation effect on the bacterial species were determined. Total bacterial load on the medium and bacteria species were identified in terms of their morphological characteristics using the spread plate method. Bacteria that emerged at different times in the trial sets were identified as Edwardsiella tarda, Salmonella sp., Aeromonas hydrophila, Pantoea sp., Citrobacter youngae, Serratia ficaria and Citrobacter freundii. The total bacterial load in both freshwater and seawater environments in both lamp groups showed a decrease compared to the control group. With this, the conventional lamp model was more effective on the total bacterial load in the samples taken during the trial. Although all bacteria were inactive in both lamp groups, Serratia ficaria bacteria were not eliminated in the seawater environment. The results show that UV LEDs can be a better alternative to traditional UV mercury lamps for water disinfection. © 2024, Central Fisheries Research Inst. All rights reserved

A Survey of Recent Work on Energy Harvesting Networks

Harvesting ambient energy from the environment has become an attractive possibility for nodes in wireless networks. In addition to being environmentally friendly, energy harvesting networks promise almost perpetual operation which has been a holy grail for autonomous networks such as wireless sensor networks, and more recently M2M. However, achieving these benefits requires rethinking communication and network algorithms in the presence of energy harvesting. In particular, energy consumption schedules are restricted by arbitrary energy causality constraints. This paper attempts to make a concise survey of the recent body of literature which have defined and solved scheduling and optimization problems, and derived information-theoretic bounds for communication systems with energy harvesting transmitters

Effect of Different Media on Short Term Storage of Leaping Mullet (Liza saliens (Risso, 1810)) Sperm

The present study aimed to evaluate the activation characteristics of the leaping mullet spermatozoa and diluted with four different media (D1, D2, D3, D4) for 250 h at 4±2°C. the semen was collected from nine wild fish in Homa Lagoon, İzmir, Turkey in July, during reproductive season. in each trial (n = 9), semen samples were collected and mixed to reduce sperm quality variation to obtain the required gametes for the experiment. the semen was activated with natural seawater (salinity of 34, pH 7.9 and 4±2°C) to determine: motility time, motility rate and viability of sperm. Dilution with inactivation media 1:3 increased motility time of diluted semen than control group. At the end of the experiment, no significant difference was found for the duration of survival in the D2 and D4 groups. the highest survival rate was found in D2 grou