This transition occurs during the megalopal stage and is marked by a progression in the molt cycle from intermolt to
premolt stage (Forward et al.
(2008) observed glucose increase in Penaeus stylirostris only in late
premolt (D2 stage) while the effect was not observed in intermolt (C stage).
The concentration of this compound in urine is highest at the
premolt stage.
They are postmolt (A, B ), intermolt (C) and
premolt (D0, D1, D2, and D3).
In crustaceans, the molt cycle refers to the modifications that occur between two successive exuviations and has been subdivided into the following major stages: A (early postmolt), B (late postmolt), C (intermolt) and D (
premolt).
The stages of early
premolt (D1), mid
premolt (D2), late
premolt (D3), and very late
premolt (D4) were determined by the degree of epidermal withdrawal from the old cuticle and the development of new setae on the new cuticle [35].
One length was taken after molt (minimum length) and another in the
premolt phase (maximum length), when larvae have emptied their gut and became light yellow.
For wild African penguins, Cooper (3) reported a 31% weight gain in
premolt birds, with a subsequent loss of 41% of their peak body mass during the molt.
Metallothionein isoform 3 was present in
premolt and softshell crab and was absent in hepatopancreas of intermolt crab.
The weight of engorged nymphs, engorgement period and
premolt period have been the most commonly used parameters, as can be seen in relation to Amblyomma cajennense (FABRICIUS, 1787) (OLIVIERI et al., 1986; BARBIERI et al., 2001; PINTER et al., 2002), Amblyomma tigrinum (Kock, 1844) (LABRUNA et al., 2002), Amblyomma triste (Kock, 1844) (LABRUNA et al., 2003), Haemaphysalis leporispalustris (Packard, 1869) (FREITAS et al., 2000) and Rhipicephalus sanguineus (Latreile, 1806) (BARBIERI et al., 2003).
All females captured on islands number 203 and 62 in the Gyrfalcon Archipelago (Chapdelaine et al., 1986) stayed within the archipelago during
premolt, whereas females captured on the island in Leaf Bay stayed along the mainland south of Leaf Bay.
Calcium fluorescence in Y-organ cells increased >6-fold between intermolt (stage C) and late
premolt (stage D3) (P<0.05), then dropped during postmolt (stage A) to a level indistinguishable from that seen in intermolt (P>0.05).