During monthly samplings between September 1998 and August 2000, 3,660 specimens of Ucides cordatus (Linnaeus, 1763) (2054 males 1606 females) were obtained examined for size (CW = carapace width) to determine growth-age equations each sex. This species showed a slower growth, with marked seasonal oscillation, in females as compared males, suggesting application the nonseasonal von Bertalanffy growth model, respectively. |${CW_\infty }$| |$k$| constant closely similar two sexes...

Microplastics are practically ubiquitous contaminants in all environments on the planet. Therefore, present work aimed to investigate microplastic contamination lettuce, chives, and cilantro sold Itacoatiara, Central Amazon, Brazil. Samples of each vegetable were acquired from different commercial establishments. The samples washed with filtered distilled water remove any particles surface vegetables. Hydrogen peroxide was added used wash vegetables digest organic materials. solution stirred...

A total of 2,130 individuals Ucides cordatus (1,255 males and 875 females) were captured in a mangrove forest at Iguape, São Paulo, Brazil. For each crab, the following body structures measured: carapace (width = CW; length CL; depth CD), 5th abdominal somite (AW), major chelar propodus (length PL; width PW; PD), 1st 2nd gonopod pairs GL1 GL2). The Student "t" Snedecor "F" tests used to verify any changes growth allometric rates during ontogeny. relationships CLxCW, PLxCW (for both sexes),...

Ovigerous females of Ucides cordatus were collected at different mangrove areas in Iguape, SP, Brazil, and reared the laboratory order to describe each embryonic stage. Accounts biometry, internal morphology, coloration eggs taken. The development took |$19 \pm 1 \ {\rm d}$| (27°C, 12:12 h) with eight well-defined stages. A salinity test on was conducted, a better result obtained rearing 15‰. Eggs are slightly ellipsoid through undergo an increase 13.9% diameter 91.7% volume. Cluster...

A total of 58 Ucides cordatus (Linnaeus, 1763) ovigerous females in final embryonic stage were collected mangrove forest at Iguape (Sao Paulo). Each female kept laboratory until the larvae hatching and had their carapace width (CW) measured with caliper (0.05 mm) larval number (LN) calculated by volumetric method. The rates (HR) for each animal's size class (5 mm). values LN CW obtained subjected to regression analyses best fitting model was chosen comparing determination coefficients (R2)....

Abstract A total of 2629 individuals Arenaeus cribrarius (1293 males and 1336 females) were captured in Ubatuba (SP), from August 1996 to July 1997. Individuals distributed 5 mm size class carapace width (CW), verify sex‐specific growth‐age equations. The Von Bertalanffy model was chosen determine the growth rate expressed by CW = 120.52[1–e−1.80t ] for 100.81[1–e−1.60t females. age estimated first juvenile stage (t 0) 6.1 8.3 days females, respectively. maximum determined 1.8 years 2 which...

The mangrove crab Ucides cordatus is one of the most exploited crustaceans in Brazil. present study investigated breeding season this species and period “andada” phenomenon, when crabs are active outside their burrows perform agonistic behaviors. Furthermore related them to environmental factors, a on coast Brazil, with inferences about management crab. reproduced from October through February. occurred November February, typical characteristics first two months, during full new moon...

Trawl fisheries are associated with catches of swimming crabs, which an important economic resource for commercial as well small-scale fisheries. This study evaluated the population biology and distribution crab Callinectes ornatus (Ordway, 1863) in Estuary-Bay São Vicente, state Paulo, Brazil. Crabs were collected from a shrimp fishing boat equipped semi-balloon otter-trawl net, on eight transects (four estuary four bay) March 2007 through February 2008. Specimens caught identified, sexed...

The aim of the present study was to characterize external morphology and orientation burrows constructed by mangrove crab Ucides cordatus . Data were obtained from two forests similar vegetation dominance ( Laguncularia racemosa ) but differing in flooding heights. These mangroves located near Barra de Icapara, Iguape City (SP), Brazil, (24°50′36″S–47°59′53′W). A total 221 examined (120 on high 101 low mangrove). External recorded photographs for categorization description. directions burrow...

ABSTRACT Few studies in the Amazon region have evaluated anuran diversity urban forest fragments or areas with differing degrees of anthropogenic impact. We determined composition and abundance anurofauna rural sites within municipality Itacoatiara central Amazonia, Brazil. Specimens were sampled from January 2012 to May 2013 10 five sites. A total 1,538 anurans (930 608 sites) recorded, belonging 29 species families. Species richness was higher sites, exclusive species. All found also...

A marine biological invasion is a natural process accelerated by human activities, and the crab Charybdis hellerii an example of globally widespread invasive species. This study evaluated color variation in C. its relationship to sex, size sexual maturity these crabs, compared efficiency freeware digital image-editing program with commercially available program. The individuals was analyzed using standardized images. pattern varied significantly size; smaller immature were darker than larger...

The objective of the present study was to analyze meat yield for both sexes crab Callinectes bocourti in region Iguape, Brazil.The carapace width males 78.1-114.0mm (96.7 ± 9.5 mm) and females 76.0-106.3mm (93.0 7.8 mm).In males, total wet weight ranged from 65.53 224.36 g (134.04 40.77 g) 56.66 164.74 (105.93 26.88 g).A comparison morphological structures revealed that greatest (55.1%), followed by right chela (16.9%), left (15.9%), legs (12.1%).The (28.5%) slightly higher than (22.1%).In...

The population structure and reproduction of Macrobrachium brasiliense were studied with the aim better understanding ecology this species in relation to Amazonian flood-pulse regime. A total 3,306 animals caught monthly from August 2011 July 2013 at Carú River, Itacoatiara, Amazonas State (Brazil). average carapace length males (6.87 ± 3.45 mm) females (6.88 4.78 did not differ significantly (U = 0.608; p= 0.5432) for overall study period. sex ratio was biased toward (M:F 1:1.61; χ2=83.855;...

This study investigated the behaviour of Pomacea bridgesii, describing daily activity, substrate selection and influence flood regime in Amazon, species’ native habitat. The present described activity selection, evaluated adaptations gastropods a simulated flood-pulse regime. Gastropods were collected Amazonas, Brazil, June 2013. Assessments behaviour, simulation made experimental water tanks. snails observed hourly for 48h, their recorded on an ethogram. more active during night, when up to...

Parental care is a common strategy in many animal groups, to increase survival of the off-spring. Here, we report parental freshwater crab Sylviocarcinus pictus. A female caught Amazon River, Brazil, bore juvenile crabs rather than eggs on her abdomen. Kept laboratory, retained juveniles abdomen for 17 days, after which left total 341 measuring 3.45 ± 0.12 mmwere recorded. This pattern very important maintenance local populations S. pictus, because if larvae were released, as occurs marine...

Embryology or the swimming crab Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae).Ovigerous females of were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±IOC), salinity (35±I %o) photoperiod (12: 12).A small sample eggs was for each 24h, morphological description, chromatic changes biometric analysis throughout embryonic development.Eight egg stages photographed had their large diameters measured a microscope provided with camera...

Chitin is the second most abundant biopolymer worldwide and found in a large variety of animals. Besides shrimps, other species possess significant chitin contents their external non-edible fraction, thus allowing them to be also economically viable sources this macromolecule. According mass-loss evaluation crab residues, 78.4% mass comprised CaCO3 21.6% associated organic phase. The content was 8.0% residue's initial after deacetylation step, average chitosan yield 5.0% residue mass....

The bioecology of freshwater prawns can be understood by studying their reproductive biology. Thus, the aim this paper was to determine and compare potential four caridean collected in Amazon region. For two years, we captured females Macrobrachium brasiliense, Palaemon carteri, Pseudopalaemon chryseus Euryrhynchus amazoniensis from inland streams municipality Itacoatiara (AM). At laboratory, measured biometric variables total length, carapace abdomen length weight, recorded number eggs (NE)...