Colour variable: green, red or yellow 6. . Mach-Aigner, A.R. A, green male (CI = 1); B, yellow male (CI = 6); C, orange female (CI = 9); D, red female (CI = 12). [47] Almost all of these traits are shared throughout the crustacean family and it all applies to the C. maenas. [34] Host specificity testing has recently been conducted on Sacculina carcini, a parasitic barnacle, as a potential biological control agent of C. Naylor, E
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Individuals that devote their resources to growth, molt more frequently and are greener. Due to the difficulty of quantifying what is actually a continuum of color, crabs often are simply divided into “green” or “red” phases but such approach does not consider the possibly distinct characteristics of intermediate yellow crabs. For example, Rewitz et al. Abelló, P.
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Web publication", "Biotic resistance to invasion: Native predator limits abundance and distribution of an introduced crab", "Green Crabs are Wrecking Havoc on Our Coastal Habitat so Let's Eat Them", https://umaine.edu/news/blog/2017/06/06/food-thought-green-crab-pastries-pass-umaine-taste-test/, http://digitalcommons.library.umaine.edu/etd/78/, "Green crabs are multiplying. Andersen, O
A total of 528 green-phase and 666 red-phase crabs were larger than 60 mm CW, whereas only 276 green-phase and 5 red-phase crabs had a CW < 30 mm. Shahidi, F.
. [25] In California, preferential predation of C. maenas on native clams (Nutricola spp.) &
Seasonal catch per unit effort was highest in the fall (October-December), followed by summer (July-September), spring (April-June) and winter (January-March). After a 24 h soak, crabs were removed, traps re-baited and allowed to soak for an additional 24 h. Total soak time on the bottom was approximately 48 h. All C. maenas individuals captured were bagged and frozen for future analysis. Fowler, A.E
Therriault, T.W
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The vast majority (97.7%) were green-phase crabs, whereas only 54.8% of the 7517 mature crabs (CW > 30 mm) captured were green phase. A Mann-Whitney-Wilcoxon test (hereafter referred to as Wilcoxon test) and Kruskal-Wallis ANOVA (if there were more than two levels being compared) were used for each pair in which non-normal distribution was ranked for several sample groups. Removal of C. maenas after 24 h eliminated the possibility of escapement and of reduced catch due to intimidation of later arrivals as a result of trap saturation.
For the consumption of soft-shell crabs, it would be necessary to know when and how many crabs could be expected to molt at particular times of the year, and because molting is tied to ventral coloration, knowledge of the distribution of color phases throughout the year would be useful. Williams, A.B. Crabs captured at sites with very fine sand (BP and HYY) were significantly larger than crabs captured at sites with other sediment types (Table 4). Where ranks were indicated under the Wilcoxon test, the test was performed individually for each pair. ,
Armstrong, D.A
The undulations, which protrude beyond the eyes, are the simplest means of distinguishing C. maenas from the closely related C. aestuarii, which can also be an invasive species. &
Similar results were seen in the present study, where red-phase females were most common in the spring and green phase in the fall whereas males were reddest in the spring and fall and greenest in the summer.