eyestalk


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eyestalk

[′ī‚stȯk]
(invertebrate zoology)
A movable peduncle bearing a terminal eye in decapod crustaceans.
References in periodicals archive ?
The technique of unilateral eyestalk ablation has been applied with success on the gonadal maturation induction of crustacean decapods (PRIMAVERA, 1978), resulting in anticipation of ovigerous condition and an increase in spawning frequency.
This may be nearly as long or longer than the eyestalk and is not micropapillate, but it is often slightly expanded and flattened distally, and a dorsal longitudinal groove is frequently evident.
The maximal level of suppression (~50%) was simila r to that observed when blue crab Y-organs were incubated with eyestalk extract containing native MIH.
Variations of the level of the digestive enzymes during the intermolt cycle of Palaemon serratus: influence of the season and effect of the eyestalk ablation.
Snout expanded laterally, but not strongly so; free margin of cephalic lappets relatively coarsely divided (2-3 digits); right post-ocular peduncle well developed, arising beside base of eyestalk, somewhat flattened and with a distinct dorsal groove; right subocular tentacle not evident; left neck lobe with numerous tentacles of varying size, right lobe with finely fimbriate margin and approx.
The synthesis of ecdysteroid molting hormones by crustacean Y-organs is negatively regulated by molt-inhibiting hormone (MIH) a neuropeptide produced and released from eyestalk neurosecretory cells.
Because of the important role of the endocrine glands in the eyestalk of lobsters, and their role in several physiological processes such as molting and growth, we strongly suggest that this syndrome be included as part of a continued lobster health assessment management program so that this disease and its possible northward advancement into the Gulf of Maine can be monitored.
However, Chung & Webster (2003) noted a 2-fold decrease in AK expression during premolt in neural tissue of the eyestalk of the green crab, Carcinus maenas.
They were eyestalk ablated to induce molting by removing the sinus gland X-organ complex, which produces a molt-inhibiting hormone.
2005b), bioaccumulates in the eyestalk, and leads to morphological changes in cells in the hepatopancreas that may affect the synthesis and incorporation of chitoproteins into adult post-molt shells (Walker et al.