Effects of Eyestalk Ablation at Different Times of the Year on Molting and Reproduction of the Estuarine Grapsid Crab Chasmagnathus Granulata (Decapoda, Brachyura)

Effect of eyestalk ablation on the metabolic activities of two penaeid prawns:Metapenaeous monocerosandM. dobsoni(De Man)

“…The inference that during every season of the year, bilateral ablation is a very strong inducer of moulting for both sexes of the estuarine grapsid crab, Chasmagnathus granulata was drawn by Stella et al (2000). It has been observed by Trisak (1990) that inter-moult periods of Penaeus monodon fabricius increased with the increase in the size of the experimental shrimps, but decreasing water salinity in the range 10-30 PSU had no significant effects on moulting cycle of P. m. fabricius.…”

Moult induction methods in soft‐shell crab production

“…Eyestalk ablation essentially removes the XO‐SG complex, thus stopping or suppressing the production of MIH and allowing ecdysteroids produced by the Y‐organ to act (Stella et al, 2000). Eyestalk ablation successfully reduced the moulting duration of economically important brachyuran species (Table 1).…”

“…It was found that crabs subjected to eyestalk ablation at intermoult stage exhibited shorter intermoult duration compared with those that had their eyestalk ablated during postmoult stage or without eyestalk ablation (Rana, 2018; Sukardi et al, 2019). Also, bilateral eyestalk ablation induced faster moulting and resulted in higher moulting rate compared with unilateral ablation (Stella et al, 2000). Evidently, haemolymph ecdysteroid levels increased significantly after eyestalk ablation in crabs (Sudha & Anilkumar, 2007; Tamone et al, 2005) and were found to be even higher than the ecdysteroid levels of normal premoult individuals (Abuhagr et al, 2014; Sudha & Anilkumar, 2007).…”

“…The ability to induce moulting is obvious in most moult induction methods although different methods use different approaches. For example, eyestalk ablation and the inhibition of MIH method suppress MIH production and thus promote the expression of ecdysteroids (Qiau et al, 2018; Stella et al, 2000). The administration of ecdysteroid and phytoecdysteroid into crab directly increase its ecdysteroid level and accelerate the moulting process (Fujaya, 2011; Raghavan & Ayanath, 2019).…”