scholarly journals The effect of low pH on physiology, stress status and growth performance of turbot (Psetta maxima L.) cultured in recirculating aquaculture systems

2018 ◽  
Vol 49 (10) ◽  
pp. 3456-3467 ◽  
Author(s):  
Vasco C. Mota ◽  
Jochem Hop ◽  
Luís A. Sampaio ◽  
Leon T. N. Heinsbroek ◽  
Marc C. J. Verdegem ◽  
...  
Keyword(s):  
Growth Performance ◽  
Low Ph ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Psetta Maxima

scholarly journals Effects of Stocking Density on Growth Performance and Stress Responses of Bester and Bester ♀ × Beluga ♂ Juveniles in Recirculating Aquaculture Systems

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2292
Author(s):  
Lorena Dediu ◽  
Angelica Docan ◽  
Mirela Crețu ◽  
Iulia Grecu ◽  
Alina Mogodan ◽  
...  
Keyword(s):  
Growth Performance ◽  
Stress Responses ◽  
Stocking Density ◽  
Serum Cortisol ◽  
Lower Serum ◽  
Serum Parameters ◽  
Hematological Indices ◽  
Recirculating Aquaculture ◽  
Crowding Stress ◽  
Recirculating Aquaculture Systems

The study aimed to compare the growth performance and physiological responses of bester (B) and backcrossed bester ♀ × beluga ♂ (BB) in response to crowding stress under different stocking densities, as well as to establish a threshold stocking density for rearing BB in a recirculating aquaculture system (RAS) without welfare impairment. For this purpose, in the first trial (T1), B (181.15 ± 21.21 g) and BB fingerlings (181.98 ± 28.65 g) were reared in two stocking densities of 2 kg/m2 and 4 kg/m2 in fiberglass tanks (1 m3) for 6 weeks. In a parallel trial (T2), the BB hybrids (335.24 ± 39.30 g) were kept in four initial stocking densities, ranging from 5 kg/m2 to 12 kg/m2. The results of T1 revealed better growth indices (i.e., final mean weight, weight gain, specific growth rate) at lower stocking densities for both hybrids; however, in terms of growth performance, the BB hybrid showed better results when compared with the B hybrid. BB hybrids registered significantly (p < 0.05) lower serum cortisol and MDA and higher lysozyme than B hybrids, showing higher tolerance to crowding stress. Nevertheless, at higher densities, selected serum parameters (i.e., hematological indices, cortisol, glucose, protein, malondialdehyde, lysozyme) and growth performance indices used to evaluate the hybrids indicate that high stocking density could affect the growth and welfare of BB hybrids, and that the selected serum parameters could be used as good indicators for chronic stress caused by overcrowding conditions.

scholarly journals Growth performance of common catfish (Ameiurus melas Raf.) fingerlings fed mealworm (Tenebrio molitor) diet

2015 ◽  
Vol 1 (3) ◽  
pp. 233-240 ◽  
Author(s):  
A. Roncarati ◽  
L. Gasco ◽  
G. Parisi ◽  
G. Terova
Keyword(s):  
Body Weight ◽  
Survival Rate ◽  
Growth Performance ◽  
Control Diet ◽  
Tenebrio Molitor ◽  
Monthly Basis ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Fish Tank ◽  
Ameiurus Melas

A pre-fattening trial was performed to evaluate the effect of replacement of fishmeal (FM) with insect meal (IM; Tenebrio molitor) on growth performance and survival rate of common catfish (Ameiurus melas). Fingerlings of A. melas (mean body weight 0.248±0.07 g) were randomly distributed over 4 indoor tanks of 2 m3 at a density of 2,000 fish/tank, and kept at a temperature of 23-25 °C in two separated recirculating aquaculture systems. Fish were divided into two groups (two tanks per group): FM and IM. Fish of the FM group were fed with a control diet (51.6% protein and 18.1% lipid), whereas those of the IM group received a diet (50.8% protein and 22.1% lipid) in which 50% of FM was substituted with IM. Chemical parameters (moisture, crude protein, total lipids, ether extract, and ash) and fatty acid profile of the two feeds is reported. The feeding trial lasted 90 days and fish were weighed at the beginning of the trial and then on monthly basis. Growth performance was good in both groups. However, fish of the IM group reached a final mean body weight (4.2±0.6 g) significantly lower (P<0.01) than that of the FM group (5.13±0.7 g). The survival rate of FM group (79%) was higher than that of IM (70%), too. In conclusion, the results of this study demonstrated that the diet with insect meal was able to sustain growth in catfish fingerlings but fish fed with FM performed better than those fed with IM.

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