Does Circadian Rhythm Disorder Always Harm Organisms? Positive Effects of Circadian Rhythm Disorder in Lates calcarifer

Hong, Jiawei; Cheng, Dachuan; Zhou, Shengjie; Ma, Zhenhua

doi:10.3923/pjbs.2019.452.456

Cited by 1 publication

(1 citation statement)

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“…The cortisol (COR) concentration increase was contained in resulting physiological changes. Generally, under the stressful events, the soaring degree of COR concentration is considered as one of the most popular, convenient and sensitive indicator to evaluate the stress responses (Acerete et al, 2004; Ellis et al, 2012; Hong et al, 2019; Long et al, 2019; Mi et al, 2012). Cortisol is a kind of hormone which released through the hypothalamus–pituitary–interrenal axis of the head kidney.…”

Section: Discussionmentioning

confidence: 99%

Effects of transporting stress on the immune responses of Asian seabass Lates calcarifer fry

Hong

Zhou

et al. 2020

Aquaculture Research

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Transportation is of high risk and cannot be avoided during the productive practice of Lates calcarifer fry. To achieve an optimal transporting protocol, the changes of physico‐chemical indexes and immune genes expression of fry after transportation were evaluated. The fish were simulated transported at the density of 7 kg/m3 for different time (T1 = 4 h, T2 = 8 h, T3 = 12 h, T4 = 16 h, T5 = 20 h, T6 = 24 h) and at three densities (D1 = 14 kg/m3, D2 = 21 kg/m3, D3 = 28 kg/m3) for 24 h. With the intensive stress, a decrease in pH and an increase in NH4+‐N were observed. At transporting density experiment, the cortisol of every group except T3 had a significant difference with the control. ALT, AST and ACP activity were all close to a rise first and then decline trend. IL‐8, TNF and IFN‐γ1 were activated to promote inflammation at different degrees of transportation pressure, while the tendency of L10 and TGF‐β1 was similar. CRP also had no significant increase under different transporting durations stress. HSP70 undertook main repair work as expression level of it increased gradually. Complement did not reach its release standard at duration experiment expect for T3 group of C3. However, density experiment had no obviously positive effects on physico‐chemical indexes and the relative expression of immune genes. The results indicated that when the transporting time exceeded 8 h at the density of 7 kg/m3, significant immune response started happening to fish. The transporting density stress has stimulated the fries but the immune response was still under the inhibited state owing to the ammonia toxicity reduction by much lower pH.

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