AIM: The population biology of the freshwater shrimp Macrobrachium jelskii was investigated here emphasizing length-frequency distribution, sex ratio, reproductive period and juvenile recruitment. In addition, abundance individuals correlated with abiotic factors. METHODS: Samples were collected on a monthly basis from July 2005 to June 2007 along river margin in shallow water Grande River, at Planura region, State Minas Gerais, Brazil (20º 09' S 48º 40' W), using trawl net (1.0 mm mesh...

The relative growths of Persephona lichtensteinii , P. mediterranea and punctata were investigated on the south-eastern Brazilian coast, focusing differences in growth rates between immature mature phases, onset morphological sexual maturity, breeding seasons these species. Crabs collected every two months from January 1991 through to November 1992, a shrimp fishing boat equipped with otter-trawl nets. Significant patterns body observed phases all three Changes chelipeds (males) abdomen...

Abstract The distribution of benthic organisms is directly or indirectly associated with the physical and chemical properties water sediment. This study analysed spatial temporal Rimapenaeus constrictus in unconsolidated sublittoral sediments two areas off northern coast state São Paulo, Brazil. We also association environmental factors occurrence this species. Shrimp were collected monthly from July 2001 to June 2003, a fishing boat equipped double-rig nets, regions Ubatuba (UBA)...

Abstract Some decapod species have intraspecific morphological variations that result in distinct adult morphotypes influence the population structure, social dominance, and reproduction of population. Here we investigated whether this differentiation into occurs males Macrobrachium brasiliense , through analysis relative growth morphology. Specimens were collected region Uberlândia, Minas Gerais state, southeastern Brazil. Seven dimensions each male measured: carapace length (CL), ischium...

The population biology of Nematopalaemon schmitti in the Ubatuba region on northern coast state São Paulo was characterized through analyses length-frequency distribution, sex ratio, reproductive period, and juvenile recruitment. specimens were caught monthly from January 1998 to December 1999, a shrimp boat equipped with double-rig trawl nets. A total 1073 analyzed, carapace length (0.1 mm) each individual noted. analyzed consisted 152 juveniles, 437 adult males, 296 females, 188 ovigerous...

ABSTRACT The main objective of this study was to estimate the morphological sexual maturity Macrobrachium brasiliense (Heller, 1862) and analyze relative growth species. During one year sampling, from July 2012 June 2013, 199 specimens were collected in a stream located Cerrado biome, Triângulo Mineiro region, state Minas Gerais. Once identified sexed, length carapace, segments chelipeds (ischium, merus, carpus, propodus dactyl) width pleura measured (mm). maximum mean sizes carapace 20.5 mm...

The aim of this study was to describe the first records termite activity on non-fossilized human bones in Brazil. cases reported resulted from forensic analysis six skeletons found northeastern Brazil between 2012 and 2014. Traces tunnels nests commonly produced by termites were several bone surfaces as well specimens characteristic signs osteophagic activity. In four cases, species identified: Amitermes amifer Silvestri, 1901, Nasutitermes corniger (Motschulsky, 1855) (on two skeletons),...

The spatio-temporal distribution of the soft bottom dwelling shrimp Nematopalaemon schmitti and effect environmental conditions (sediment characteristics, temperature, salinity dissolved oxygen) on its abundance were studied at Ubatuba Bay, south-eastern coast Brazil. Surveys conducted monthly from September 1995 to August 1996. Each sampling set comprised eight different transects distributed within bay. Comparisons CPUE among stations demonstrated that N. was greatest during winter, when...

The crab Hepatus pudibundus is an abundant species, part of the crustacean fauna caught as by-catch in shrimp fishery off Brazilian coast. This study investigated its distribution and population structure relative to measured environmental factors, sex ratio juvenile recruitment species sheltered exposed areas each three bays on northern coast State São Paulo, Brazil. crabs, along with water sediment samples, were collected monthly from January 1998 through December 1999. A total 8674...

Abstract Aim We studied the niche evolution and diversification modes in transisthmian Alpheus shrimps by examining interplay between environmental divergence conservatism allopatric sister species. In a broader perspective, current study analysed of climatic role environment species shrimp. Location Atlantic Eastern‐Pacific oceans. Taxon (Caridea: Alpheidae). Methods assembled georeferenced occurrences for 33 (with 24 species) from time‐calibrated molecular phylogeny. modelled their...

In this study, we estimated the size at onset of maturity (carapace width, CW50) and analyzed relative growth some body parts heterochely mud crab Hexapanopeus paulensis. A total 800 crabs were collected, from January 1998 to December 1999, on southeastern coast Brazil. Each specimen was sexed measured. CW50 be 6.7 mm in males 6.3 females. Carapace length negatively allometric both sexes. Cheliped height positively for Gonopod isometric (b = 1) juvenile adult females, right cheliped larger...

The variation in reproductive investment (RI) and the hypothesis of multiple spawning were evaluated redfinger rubble crab Eriphia gonagra (Fabricius, 1781). gonads embryos showed synchronous development, fecundity RI varied widely among females same size class. mean value recorded was 11.31%, with no significant differences means for different classes. allometric analysis indicated decrease while body increase, but we suggested that this occurs due to overestimation where largest width...

Caprellid amphipods play an important role in coastal ecosystems, establishing a link between producers and higher trophic levels. Also, they are sensitive to environmental changes, toxins pollutants. The aim of the present study was analyse main reproductive parameters (fecundity, periodicity juvenile recruitment) sympatric species Caprella danilevskii , C. equilibra scaura associated with Sargassum cymosum (Phaeophyta, Fucales) beds on southeastern coast Brazil, order evaluate strategies...

The goal of this study was to evaluate the reproductive investment (RI) and fecundity shrimp Nematopalaemon schmitti (Holthuis, 1950), caught by trawling in southeastern Brazilian coast 2008, 2009 2011. carapace length (CL) ovigerous females measured development stage their ovaries embryos were analyzed. A significant relationship observed between female body embryo weights (Linear regression: r² = 0.26, F 20.77, P < 0.0001, Ln BDW 0.92. FBDW - 2.24) number CL regression; I: 0.38, 36.15,...

This study analysed the influence of temperature, salinity and sediment texture on distribution pink shrimp juveniles (Farfantepenaeus brasiliensis) over a 20-year period. The shrimps were sampled monthly in Fortaleza Bay, north coast São Paulo, Brazil, November 1988–October 1989 (period 1) then 20 years later 2008–October 2009 2). In period 1 we captured 80 whereas 2 226. abundance F. brasiliensis seemed to be modulated by temperature texture, along with fishing activity. management...

The prawns Macrobrachium amazonicum and jelskii, have been introduced in the southeastern Brazilian region. Thus, it becomes necessary knowing reproductive aspects of these invasive species. This study aimed to analyze relative growth estimate morphological sexual maturity freshwater prawn species M. jelskii. We collected monthly samples from January through December 2010 th Rio Grande riverbank. Prawns were measured their cephalothorax length (CL), pleura second abdominal somite females...

The main objective of this study was to analyze the choice behavior adult individuals Macrobrachium brasiliense (Decapoda, Palaemonidae) with regard different substrates and microhabitats in two distinct experiments. first experiment offered prawns three samples granulometries: fine sand, coarse gravel. second types microhabitats: aquatic macrophytes, wood fragments, rocks. In general, chose substrate, a significant extent (ANOVA, p &lt; 0.01). microhabitat experiment, selected fragments...

Abstract Lysmata vittata is considered an invasive shrimp in the Atlantic Ocean and some characteristics might have contributed to its success, such as larval nutritional vulnerability during early stages of development. The objective this study was evaluate L. . Ovigerous specimens were captured estuarine region north-eastern Brazil. Zoeae assigned two experiments: (1) point no return (PNR), consisting treatments with increasing number days starvation subsequent feeding; (2) reserve...

AbstractThe lifestyle of symbiotic species in the genus Synalpheus can vary from pair living to eusocial. A pair-living social system commonly implies adoption a monogamous mating system. In this study, we used shrimp brevicarpus association with sponge Dysidea sp. test hypothesis that heterosexual pairs shrimps adopt when morphologically complex host. We collected total 40 sponges, which were inhabited by 76 shrimps: 41 males, 33 females, and 2 juveniles. is sexually dimorphic, males...

During ontogeny, the allocation of energy can differ throughout life cycle a species, especially from juvenile to adult. The present study aimed describe relative growth, heterochely, and laterality patterns freshwater prawn Macrobrachium brasiliense. Carapace length (CL), abdomen (AL), left cheliped (LCL), right (RCL), width (AW) males females were measured. Differences in morphometric relationships between juveniles adults evaluated using analysis covariance (ANCOVA) linear regressions....