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- Q5422871 subject Q7216357.
- Q5422871 subject Q8253648.
- Q5422871 abstract "Eyestalk ablation is the removal of one (unilateral) or both (bilateral) eyestalks from a crustacean. It is routinely practiced on female shrimps (or prawns) in almost every marine shrimp maturation or reproduction facility in the world, both research and commercial. The aim of ablation under these circumstances is to stimulate the female shrimp to develop mature ovaries and spawn.Most captive conditions for shrimp cause inhibitions in females that prevent them from developing mature ovaries. Even in conditions where a given species will develop ovaries and spawn in captivity, use of eyestalk ablation increases total egg production and increases the percentage of females in a given population that will participate in reproduction. Once females have been subjected to eyestalk ablation, complete ovarian development often ensues within as little as 3 to 10 days.The most commonly accepted theory of why eye ablation reduces this inhibition is that a gonad inhibitory hormone (GIH) is produced in the neurosecretory complexes in the eyestalk. This hormone occurs in nature in the non-breeding season and is absent or present only in low concentrations during the breeding season. The reluctance of most shrimp to routinely develop mature ovaries in captivity is a function of elevated levels of GIH, and eyestalk ablation lowers the high haemolymph titer of GIH. The effect of eyestalk ablation is not on a single hormone such as GIH, but rather affects several physiological processes. Besides the GIH evidence, another hypothesis suggests that eyestalk ablation also reduces light intensity and thereby induces ovarian maturation. In the banana prawn (Fenneropenaeus merguiensis, syn. Penaeus merguiensis), dim light favours ovarian maturation and spawning. The exact mechanism of eyestalk ablation on the ovarian maturation is not conclusive.It has been reported that in the tiger prawn (Penaeus monodon), the eyestalks fully regenerate in less than 6 months.".
- Q5422871 thumbnail CSIRO_ScienceImage_2844_A_Prawn.jpg?width=300.
- Q5422871 wikiPageWikiLink Q1040689.
- Q5422871 wikiPageWikiLink Q1136347.
- Q5422871 wikiPageWikiLink Q1433370.
- Q5422871 wikiPageWikiLink Q213456.
- Q5422871 wikiPageWikiLink Q2144381.
- Q5422871 wikiPageWikiLink Q216935.
- Q5422871 wikiPageWikiLink Q25364.
- Q5422871 wikiPageWikiLink Q322177.
- Q5422871 wikiPageWikiLink Q381084.
- Q5422871 wikiPageWikiLink Q4441421.
- Q5422871 wikiPageWikiLink Q485675.
- Q5422871 wikiPageWikiLink Q578204.
- Q5422871 wikiPageWikiLink Q7124842.
- Q5422871 wikiPageWikiLink Q7216357.
- Q5422871 wikiPageWikiLink Q8253648.
- Q5422871 wikiPageWikiLink Q935672.
- Q5422871 wikiPageWikiLink Q9631.
- Q5422871 comment "Eyestalk ablation is the removal of one (unilateral) or both (bilateral) eyestalks from a crustacean. It is routinely practiced on female shrimps (or prawns) in almost every marine shrimp maturation or reproduction facility in the world, both research and commercial.".
- Q5422871 label "Eyestalk ablation".
- Q5422871 depiction CSIRO_ScienceImage_2844_A_Prawn.jpg.