This study evaluates the growth, proximate, and fatty acid composition of black mussel, Mytilus galloprovincialis fed four marine microalgae (Pavlova lutheri, Nannochloropsis oculata, Diacronema vlkianum and Rhinomonas reticulata) diets for 21 days. Black mussel is a common bivalve species that has been recognized as important for marine aquaculture with increasing production in the last two decades. The mussel group fed N. oculata showed a significantly lower survival rate than the other groups (p < 0.05). Shell height, length, and width of mussels were measured. The height and length of the mussel group fed N. oculata were statistically higher than other experimental groups (p < 0.05). Shell width did not show any significant differences among groups (p > 0.05). The microalgae N. oculata showed the highest protein content whereas P. lutheri had the highest crude lipid content among dietary treatments. The group fed P. lutheri showed significantly higher protein, lipid, and ash contents among experimental groups (p < 0.05). The D. vlkianum diet enhanced the highest docosahexaenoic acid level in black mussels. Black mussel fed P. lutheri showed the highest eicosapentaenoic acid and polyunsaturated fatty acid levels. Arachidonic acid was found to be similar among experimental groups. In our study, P. lutheri and D. vlkianum had outstanding results on survival, growth, and essential fatty acid accumulation in mussel culture.

We investigated the effects of growth performance of three plant species parsley (Petroselinum crispum), lettuce (Lactuca sativa) and cress (Lepidium sativum) under the three different lighting sources, Light-Emitting Diode lamp (LED; 200w), High-Pressure Sodium lamp (HPS; 200w) and Fluorescent lamp (FLO; 200w) in an aquaponic system. A total number of 43 koi fish (Cyprinus carpio var. koi) with 3628 g total biomass (84.4 g per individual) were used. The fish used in the experiment recorded 36% growth and reached an average individual weight of 132.7 g at the end of the experiment. The parsley plant was measured as 8.76 ±7.32 g; 7.45 ±4.13 g; 2.04 ±1.96 g weight after 45 days, the lettuce plant was 54.09 ± 25.60 g; 60.83 ±19.39 g; 17.81 ±6.40 g weight after 54 days, cress plant was 1.03 ±0.58 g; 1.15 ±0.46 g; 1.31 ±0.58 g weight after 42 days, under the HPS, LED, and FLO light sources, respectively. HPS and LED light sources in lettuce and parsley showed better plant development than the FLO, while no significant difference occurred in cress plants under three light conditions. We conclude that using HPS or LED lights in indoor aquaponics has the potential to produce good quality and adequate amounts of plants.

The European catfish (Silurus glanis L., 1758) is an important species for the aquaculture sector and the production of quality broodstock in artificial fertilization methods as well. One of the crucial steps determining the success of the reproduction of catfish is to obtain sufficient and good-quality sperm. The aim of this study is to compare two different methods used to obtain sperm from European catfish. The first method is surgery extraction of testicular sperm from taking testicles (CS) and the second method collection of sperm by stripping (SS). The fertilization rate was calculated as a percent for CS and SS groups and the highest fertilization rate was found in the SS group (81.87 ± 17.38%). According to the findings in the present study, it was concluded that it is not necessary to kill male European catfish to get sperm for fertilization.

The transition from endogenous to exogenous feeding represents an important developmental phase in European catfish (Silurus glanis) larviculture, frequently accompanied by high mortality and sibling cannibalism. However, an appropriate feeding frequency to support growth and survival while minimizing cannibalistic losses remains poorly defined. This study evaluated the effects of four feeding frequencies (4, 6, 8, and 12 times day⁻¹) on growth performance, survival, and visible cannibalism over 15 days in a recirculating aquaculture system at 5 larvae L⁻¹. Larvae were fed ad libitum to apparent satiation at each feeding event; consequently, the total daily feed ration was not fixed across treatments. Feeding frequency significantly affected final body weight, weight gain, final total length, length gain, survival, visible cannibalism, and size uniformity, whereas specific growth rate did not differ significantly among treatments. Larvae fed eight times day⁻¹ achieved the highest final weight (106 ± 11 mg) and survival (77.5 ± 2.5%), while exhibiting the lowest coefficient of variation in final total length (10.40 ± 0.36%) and visible cannibalism (3.0 ± 1.2%). Visible cannibalism decreased from four to eight times day⁻¹ but increased at 12 feedings day⁻¹, which also resulted in lower growth and survival. These findings suggest that feeding eight times day⁻¹ under the apparent satiation regime used in this study provided the most favorable overall response among the tested feeding schedules during the first exogenous feeding period.