Photoperiod affects gamete production, and protein and lipid metabolism in male narrow-clawed Crayfish Pontastacus leptodactylus (Eschscholtz, 1823)

Huang

Tan

et al. 2022

Aquaculture Research

Self Cite

WGR (%) = (\frac{Final body wet weight ‐ initial body wet weight}{Initial body wet weight}) \times 100

SGR (% / day) = \frac{()(, Ln final body wet weight ‐ Ln initial body wet weight)}{Rearing period (days)} \times 100

GSI (%) = (\frac{Gonad wet weight}{Body wet weight}) \times 100

HSI (%) = (\frac{Hepatopancreas wet weight}{Body wet weight}) \times 100

…”

Section: Methodsmentioning

confidence: 99%

Effects of two natural diets on the biochemical compositions of post‐mating female mud crab ( Scylla paramamosain )

Huang

Tan

et al. 2022

Aquaculture Research

Self Cite

“…We also noticed that continuous lighting resulted in lower contents of total TAAs and nonessential amino acids such as glutamic acid, aspartic acid, and serine in B. orientalis . Similarly, the amount of serine in narrow-clawed crayfish ( Pontastacus leptodactylus , Eschscholtz, 1823) was significantly reduced under continuous lighting [ 73 ]. A higher body essential amino-acid content ( ca.…”

Section: Discussionmentioning

confidence: 99%

Biological Impact of Photoperiod on Fairy Shrimp (Branchinecta orientalis): Life History and Biochemical Composition

Kangarloei

Ahmad

et al. 2021

Biology

B. orientalis, fairy shrimp, is often among the most conspicuous invertebrates inhabiting temporary aquatic habitats with a typical variation in environmental conditions. Its life history characteristics and biochemical composition were studied under four different photoperiodic regimes (24L:0D, 0L:24D, 16L:8D, and 12L:12D). The significantly highest cumulative and initial hatching rates (48 h) were obtained at 24L:0D (p < 0.05). Cultivating the larvae under different photoperiods did not significantly affect specific growth rate (SGR) (p > 0.05). However, higher final total body length and daily growth rate were recorded under constant darkness. Higher lipid content was found at 24L:0D to the extent that it was more than two times higher than that at 16L:8D and 12L:12D (p < 0.05). There was also a remarkable increase in body crude protein content at 24L:0D (p < 0.05). Body fatty-acid profiles of the fairy shrimps were also affected by culture condition (p < 0.05). Extension of lighting period resulted in a subtle increase in body contents of arginine, lysine, histidine, isoleucine, leucine, valine, methionine, and phenylalanine, especially in the group kept under a 16L:8D regime. The highest and lowest digestive enzyme activity was observed at 0L:24D and 24L:0D, respectively (p < 0.05). In contrast, the highest and lowest soluble protein content was recorded at 24L:0D and 0L:24D, respectively (p < 0.05). Similarly, antioxidant status was significantly higher at 0L:24D (p < 0.05). In conclusion, a 16L:8D light–dark cycle might be an optimal condition in terms of growth performance and physio-biochemical characteristics. These findings could be helpful in optimizing the rearing conditions for upscaling B. orientalis production.

“…A sterile 25‐gauge needle (2.5 ml syringe) was used to withdraw haemolymph from the heart. One ml of haemolymph samples were transferred into 50 ml tubes containing 4% NaCl and acetonitrile (Farhadi & Harlıoğlu, 2019; Farhadi & Jensen, 2016). After centrifugation at 4°C and 3000 rpm (844 g) for 10 min, the supernatant fluid (plasma) was removed from hemocytes and stored at −80°C until further analysis.…”

Section: Methodsmentioning

confidence: 99%

Dietary oak ( Quercus brantii ) acorn extract affects growth performance, survival rate, haemolymph parameters, and body composition of narrow‐clawed crayfish ( Pontastacus leptodactylus )

Mosafer

Mousavi

2022

Aquaculture Research

Self Cite

Herbal extracts have been successfully utilized to improve the growth, survival, immunity, and disease resistance of aquatic animals. The present experiment was designed to investigate the effects of dietary acorn extract on growth, survival rate, proximate composition, and haemolymph parameters of narrow-clawed crayfish (Pontastacus leptodactylus). A total number of 360 crayfish (39.17 ± 0.73 g) were randomly distributed into four treatments and fed experimental diets containing 0 (control), 0.5, 1, and 2 g/kg diet of acorn extract for 90 days. The results showed significant improvement in all growth parameters, weight gain ratio (WGR), specific growth rate (SGR), food conversion ratio (FCR), and protein efficiency ratio (PER), as well as survival rate between acorn extract, supplemented crayfish and control with the maximum performance in the 2 g/kg diet of acorn extract (p < 0.05). The dietary acorn extract increased the concentration of total protein, glucose, cholesterol, potassium (K), and calcium (Ca) (p < 0.05). Hepatic enzymes, including alkaline phosphatase (ALP), lactate dehydrogenase (LDH), serum glutamic oxaloacetic transaminase (SGOT), and serum glutamic pyruvic transaminase (SGPT), were not affected by dietary acorn extract (p > 0.05), suggesting no toxic effect on the hepatopancreas. Moreover, animals fed on dietary acorn extract had higher crude protein and lower crude lipid contents compared to the control group (p < 0.05). In conclusion, our findings revealed that feeding P. leptodactylus with acorn extract at 2 g/kg level significantly improves the growth performance and survival rate, without negative impacts on the health status.