Compensatory growth in gibel carp (carassius auratus gibelio) after the stress of stocking density

Abstract

The research was performed to investigate the compensatory growth in gibel carp (Carassius auratus gibelio) after the stress of stocking density; the 8‐week growth trial was performed in a proper system of 12 fibreglass tanks. Four different density groups were marked as C (control group), D1/2, D1/4 and D1/8, and the biomasses were converted into 1.98 kg/m3, 3.96 kg/m3, 7.91 kg/m3 and 15.82 kg/m3 respectively. Under density stress, the final weight, protein retention efficiency (PRE), feed conversion efficiency (FCE) and specific growth rate (SGR) of groups D1/2, D1/4 and D1/8 were significantly lower than group C (p < 0.05) and reduced with the increase in density. In the period of the recovery of activity space (5–8 weeks), groups D1/2, D1/4 and D1/8 have significantly higher feeding rate (FR), FCE and SGR than group C. There was no significant difference in body weight between group D1/2 and group C, while the body weight of group D1/4 and group D1/8 was still significantly lower than group C. The hepatosomatic index (HSI) of the D1/8 group was extremely low before and after the restoration of activity space (p < 0.05). Under stress, the lipid contents of group D1/4 and group D1/8 were significantly lower than group C. Subsequently, the recovery of activity space, the lipid content of group D1/8, was still significantly lower than group C. The results obtained indicated that the D1/2 group (3.96 kg/m3) successfully lead to wholly compensatory growth, while the D1/4 (7.91 kg/m3) and D1/8 (15.82 kg/m3) group partially lead to compensatory growth. So, higher density leads to poor compensation effect.

Comparative analysis of different density restrictions reveals the potential influence mechanism on the compensatory growth of Litopenaeus vannamei

“…Hence, there have also been several reports on compensatory growth caused by environmental restrictions. Most of these studies only measure the apparent properties of the animal body that are compensated after being restricted, but do not quantitatively determine whether the compensation effect occurs within the entire organism (Chen et al, 2021; Hostins et al, 2015; Khanjani et al, 2019). Metabolic assessments such as protein levels and transcription have not been addressed.…”

Construction of healthy liver of largemouth bass in short-term by steroidal saponins before heat season coming

“…Under natural or farmed environments, sh are inevitably exposed to a varies of stresses, such as starvation (Fang et al 2017), salinity (Mohamed et al 2021), density (Chen et al 2021), temperature (Peng et al 2017). As well we know, optimal temperature may improve sh growth by increasing the metabolic activities (Martinez et al 1996).…”

Environmental history affects the growth and photosynthesis of a green‐tide macroalgae Ulva prolifera

“…Compensatory growth, an accelerated growth when they meet favourable conditions after a period of growth depression (Belsky et al, 1993), has been studied in plants (Paige et al, 2018), microalgae (Flöder et al, 2010), cyanobacteria (Han et al, 2015), even in gibel carp (Chen et al, 2021), but has not have been studied in macroalgae. Ulva spp.…”