Effects of using the biofloc system and eyestalk ablation on reproductive performance and egg quality of Litopenaeus vannamei (Boone, 1931) (Decapoda: Dendrobranchiata: Penaeidae)

Sperm quality and nutritional condition related to management during prematuration ofLitopenaeus setiferus(F0) males

“…The hepatopancreas is the main organ for nutrient storage in shrimp, while acylglycerides are the more efficient energy reserves per weight unit, and glucose can be easily used to obtain instant energy (Palacios et al, 1998; Rosas, Fernandez, et al, 1993; Rosas, Sanchez, et al, 1993). Acylglyceride concentrations have been employed as a condition factor in different species of larvae over the years, so the bioenergetic indices AGP and AGC are commonly applied in reproduction studies to check the migration of some nutrients in females from the hepatopancreas, ovaries, eggs and nauplii (larvae) (Emerenciano et al, 2014; Magaña‐Gallegos et al, 2021; Palacios et al, 1998; Racotta et al, 2003). In the current trial, the differences in these indices were associated with variations in hepatopancreas acylglycerides in some treatments and did not have a direct effect on spermatic quality.…”

“…The p ‐value was estimated after 9999 permutations of raw data. When significant differences were detected, a principal component analysis (PCA) was performed to represent oxidative stress biomarkers in a multivariate space and to determine which of the variables explained the most variability depending on each treatment (Magaña‐Gallegos et al, 2021).…”

“…Shrimps cultured in biofloc systems during the grow‐out phase or prematuration have shown better performance during the breeding season (Emerenciano et al, 2014; Magaña‐Gallegos et al, 2021). Biofloc has been described as a sustainable culture system that provides shrimp with probiotic media with native protein, leading to an enhancement of the nutritional and immunological status of shrimp and ultimately resulting in optimal reproductive performance (Aguilera‐Rivera, Escalante‐Herrera, et al, 2019; Aguilera‐Rivera, Prieto‐Davó, et al, 2019; Emerenciano et al, 2017; Mugwanya et al, 2021).…”

Welfare in Farmed Decapod Crustaceans, With Particular Reference to Penaeus vannamei

“…Ablation of eyestalks is broadly used in commercial hatcheries as a crude method of hormonal manipulation to induce maturation and spawning in P. vannamei. It involves the removal or constriction (through cutting, cauterizing or tying) of one (unilateral) or two (bilateral) eyestalks to reduce the level of gonad inhibiting hormone (GIH/MO-IH) which is produced by the X-organ and sinus gland complex situated in the optic ganglia of the eyestalk (Kang et al, 2014;Wang et al, 2019;Magaña-Gallegos et al, 2021). Eyestalk ablation is important as ovarian maturation of P. vannamei, is controlled by GIH hormone and is presumed to inhibit vitellogenesis (Kang et al, 2014).…”

Full-Length Transcriptome Reconstruction Reveals the Genetic Mechanisms of Eyestalk Displacement and Its Potential Implications on the Interspecific Hybrid Crab (Scylla serrata ♀ × S. paramamosain ♂)

“…Compared with normal eyestalks, displaced eyestalks were located in the center of the head and extended forward close to the antenna (detailed morphological features and photographs were shown in our previous study [ 15 ]). As we know, the eyestalk is an important neuroendocrine organ complex and controls a variety of physiological processes involving the central pacemakers of circadian rhythms [ 16 ], osmotic regulation [ 17 ], molting [ 18 ], and reproduction in crustaceans [ 19 ]. Most importantly, molting and reproduction are the essential processes to improve productivity in crustacean aquaculture.…”