Zoea


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Related to Zoea: zoeal, Zora

zoea

[zō′ē·ə]
(invertebrate zoology)
An early larval stage of decapod crustaceans distinguished by a relatively large cephalothorax, conspicuous eyes, and large, fringed antennae.

Zoea

 

a pelagic larva, one of the developmental stages of decapods. The body consists of a cephalothorax and a segmented abdomen. Only the front thoracic appendages (maxillipeds) and only the hind abdominal appendages (uropods; absent in crab zoea) are developed; the rest are in the embryonic state. The eyes are sessile. The zoea swims with the aid of its maxillipeds. The unique crab zoea have an almost spherical cephalothorax (with long fore, dorsal, and two lateral spines) and narrow abdomen.

References in periodicals archive ?
Effects of prehatching salinity and initial larval biomass on survival and duration of development in the zoea 1 of the estuarine crab, Chasmagnathus granulata.
Initial laboratory work on blue crabs indicated that zoea larvae have a kinetic response to increasing hydrostatic pressure (harokinesis) regardless of developmental stage (Table 3).
Almost similar in shape to the previous stage; the anterior spine (5.81 mm) and the posteriors (3.53 mm) differing in spinulation equal than in Zoea I.
The first zoea of three Pachygrapsus species and of Cataleptodiusfloridanus (Gibbes) from Bermuda and Mediterranean (Crustacea: Decapoda: Brachyura).
Similar relative digestibilities among the raw materials were observed among all larval stages (Z1-C), but they could be much better utilized at Mp and C stages than zoea stages (Figure 4).
After hatching, the female crab was removed from the incubation tank, using a scoop net, and the aeration was turned off in order to settle down any debris to the bottom of the incubation tank, while the energetic zoea remained active at the surface.
The survival rates at each of the five larval stages such as zoea 1 (Z1), zoea 2 (Z2), zoea 3 (Z3), zoea 4 (Z4) and megalopa (M) (identified as per Shinkarenko [18]) were calculated by daily random sampling (mortality due to any reason other than temperature or salinity variation is assumed to be the same in all the replicates of the values tested under each parameter).
The stage-1 zoea (hatching stage) will not undergo its initial molt to the stage-2 (first feeding) zoea until it reaches saline waters (Dugan et al., 1975; Jalihal et al., 1993; Bauer and Delahoussaye, 2008).
The eggs hatch into larvae called zoea that spend about a month in the ocean as tiny swimming plankton.
Zoea of the dominant local blue crab (Callinectes bellicosus) are most abundant in the BMLC during August, when the vast numerical majority (89%) have been observed (Sanchez-Ortiz and Gomez-Gutierrez 1992).
These were taken using a Van Veen grab (30 and 3.5 L of capacity) from R/V Mytilus and its auxiliary boat Zoea. Samples of the top surface centimetre were collected with a polyethylene spatula of 200 mL and stored in plastic flasks, which were stored in refrigerator at 4[degrees]C.