scholarly journals Size at sexual maturity of female crabs Sesarma rectum Randall (Crustacea, Brachyura) and ontogenetic variations in the abdomen relative growth

2005 ◽  
Vol 22 (2) ◽  
pp. 433-437 ◽  
Author(s):  
Maria H. de A. Leme
Keyword(s):  
Sexual Maturity ◽  
Carapace Width ◽  
Analysis Of Covariance ◽  
Northern Coast ◽  
Growth Phases ◽  
Differential Growth ◽  
Relative Growth ◽  
Gonadal Maturity ◽  
Body Sizes ◽  
Size At Sexual Maturity

The aim of the present study was to ascertain the size at sexual maturity in females of the crab Sesarma rectum Randall, 1840 by comparing gonadal maturity to morphologic maturity (using abdomen-width data). The relative growth of the abdomen was analysed for all growth phases (for each 3-mm carapace width size class), and the slopes of the separate allometric relationships were compared through analysis of covariance (ANCOVA) from log e-transformed data to detect changes in the level of allometry during ontogeny. The physiological size at maturity (gonadal criteria) was determined through a logistic curve, indicating the size at which 50% of females presented mature gonads (M50 = 17.4 mm CW). The highest allometric levels occurred in growth phases 2 and 3 (body sizes ranging from 15 to 21 mm CW), indicating faster growth of the abdomen during those phases. Phases 1 (< 15 mm CW) and 4 and 5 (size classes above 21 mm CW) showed isometric growth. In the study area, a mangrove on the northern coast of the state of São Paulo, Brazil, individuals of S. rectum began to reach sexual maturity from 15 mm CW onward, when the slopes of the relationship of abdomen width to carapace width became positively allometric, indicating a differential growth rate. A gradual decrease in the slope, tending to isometry, occurred during ontogeny, as the animals became larger (older).

scholarly journals The relative growth and sexual maturity of the freshwater crab Dilocarcinus pagei (Brachyura, Trichodactylidae) in the northwestern region of the state of São Paulo

2013 ◽  
Vol 103 (3) ◽  
pp. 232-239 ◽  
Author(s):  
Daphine R. Herrera ◽  
Thiago M. Davanso ◽  
Rogerio C. Costa ◽  
Fabiano G. Taddei
Keyword(s):  
Sexual Maturity ◽  
Sao Paulo ◽  
Minimum Size ◽  
São Paulo ◽  
Freshwater Crab ◽  
Relative Growth ◽  
Stage Of Development ◽  
Gonadal Maturity ◽  
Size At Sexual Maturity ◽  
Dilocarcinus Pagei

The aim of the present study was to determine the size at sexual maturity in the freshwater crab Dilocarcinus pagei Stimpson, 1861, from a population located in Mendonça, state of São Paulo, Brazil. The crabs were sampled monthly (July 2005 to June 2007), at Barra Mansa reservoir. The specimens were captured manually or in sieves passed through the aquatic vegetation. The crabs were captured and separated by sex based on morphology of the pleon and on the number of pleopods. The following dimensions were measured: carapace width (CW); carapace length (CL); propodus length (PL); and abdomen width (AW). The morphological analysis of the gonads was used to identify and categorize individuals according to their stage of development. The morphological maturity was estimated based on the analysis of relative growth based on the allometric equation y = ax b. The gonadal maturity was based on the morphology of the gonads by the method CW50 which indicates the size at which 50% of the individuals in the population showed gonads morphologically mature to reproduction. The biometric relationships that best demonstrated the different patterns of growth for the juvenile and adult stages were CW vs. PL for males and CW vs. AW for females (p<0.001). Based on these relationships, the estimated value to morphological sexual maturity was 21.5 mm (CW) in males and 19.7 mm (CW) in females. The determination of the size at sexual maturity and the adjustment of the data based on the logistic curve (CW50) resulted in a size of 38.2 mm for males and 39.4 mm for females (CW). Based on the data obtained for sexual maturity for D. pagei, we can estimate a minimum size for capture of 40 mm (CW). This minimum size allows at least half of the population to reproduce and retains the juveniles and a portion of the adults in the population.

scholarly journals Relative growth and reproduction in Achelous spinicarpus (Crustacea: Portunidae) on the south-eastern continental shelf of Brazil

2012 ◽  
Vol 93 (3) ◽  
pp. 667-674 ◽  
Author(s):  
André L. Pardal-Souza ◽  
Marcelo A.A. Pinheiro
Keyword(s):  
Continental Shelf ◽  
Sexual Maturity ◽  
Developmental Stages ◽  
Carapace Width ◽  
Gravimetric Method ◽  
Tropical Region ◽  
The South ◽  
Relative Growth ◽  
South Eastern ◽  
Size At Sexual Maturity

This investigation aimed to study the relative growth, morphological sexual maturity and fecundity of the swimming crab Achelous spinicarpus in a tropical region, on the south-eastern continental shelf of Brazil (25°S). Biometry of all specimens was conducted, including measurements of the cephalothorax, cheliped, abdomen and gonopods. Relative growth was described based on the equation for allometry (y = axb), and size at sexual maturity was determined from inflections in relations involving the cheliped, gonopods (males), and abdomen (females), as dependent variables, related to the cephalothorax width (independent variable). Fecundity was estimated by the gravimetric method. The relations of the length of the chelar propodus and carpal spine to the carapace width without the lateral spines (CW) showed positive allometry in both sexes, with a significant variation in the constant ‘b’ for males between the developmental stages (juvenile and adult) and the size at maturity estimated at 37 mm CW. In females, the abdomen was most appropriate for the estimate of morphological maturity, which occurred at a smaller size (32 mm CW), with a change in the growth pattern between the stages, passing from isometric (juveniles) to positive allometric (adults). The gonopods also showed different growth rates between developmental stages, in synchrony with the variables of the cheliped. Mean fecundity for the species was 53,984 eggs, with a positive correlation between the number of eggs exteriorized and the size of the female; the equations allowed interconversion between these variables, due to the adjustment of the power function (r2 ≥ 86%).

scholarly journals Relative growth and sexual maturity of the stone crab Menippe nodifrons Stimpson, 1859 (Brachyura, Xanthoidea) in southeastern Brazil

2007 ◽  
Vol 50 (2) ◽  
pp. 259-267 ◽  
Author(s):  
Giovana Bertini ◽  
Adriane Araújo Braga ◽  
Adilson Fransozo ◽  
Michéle de Oliveira Dias Alves Corrêa ◽  
Fulvio Aurélio de Morais Freire
Keyword(s):  
Sexual Maturity ◽  
Carapace Width ◽  
Southeastern Brazil ◽  
Positive Allometry ◽  
Relative Growth ◽  
Stone Crab

The relative growth and size at onset of morphological sexual maturity of the stone crab Menippe nodifrons were investigated. A total of 399 crabs was captured on Praia Grande and Tenório beaches at Ubatuba. Carapace width (CW) and length, cheliped propodus length and height, abdomen width in females, and gonopod length in males were recorded. In females, the abdominal width showed negative allometry for juveniles and positive allometry for adults; the puberty molt occurred at 31.6 mm CW. In males, the size at onset of morphological sexual maturity was estimated as 29.7 mm CW; the gonopod growth showed positive allometry for juveniles, and an isometric relationship for adults. The gonopod length and the abdominal width were the most appropriate morphometric variables to estimate size at onset of sexual maturity in this stone crab.

Size at maturity of Liocarcinus depurator (Brachyura: Portunidae): a reproductive and morphometric study

1999 ◽  
Vol 79 (2) ◽  
pp. 295-303 ◽  
Author(s):  
Rámon Muiño ◽  
Luis Fernández ◽  
Eduardo González-Gurriarán ◽  
Juan Freire ◽  
José A. Vilar
Keyword(s):  
Sexual Maturity ◽  
Carapace Width ◽  
Principal Component ◽  
Morphometric Study ◽  
Gonad Maturation ◽  
Body Parts ◽  
Size At Maturity ◽  
Two Phase ◽  
Morphometric Variation ◽  
Relative Growth

Sexual maturity in brachyurans is often associated with an allometric change in the relative growth of the animal. Maturity of Liocarcinus depurator was examined by analysing the monthly percentages of mature females (determined by the stage of gonad maturation and the presence of brood and sperm plugs) by size-class and the relative growth of different body parts: length and width of the carapace, length, height and width of the cheliped propodus; width of the abdominal segments in females and length of the first pleopod in males. Using the reproductive criteria the size at the onset of sexual maturity (carapace width at which 50% females are mature) in females of L. depurator is around 30–34 mm cephalothorax width. Principal component analysis (PCA) showed that the main source of morphometric variation for both sexes was due to heterochelia and allometric changes in growth. Morphometric variables were fitted using different regression techniques to one and two-phase growth models. The length of the first pleopod and the propodus of the right cheliped in males, and width of abdominal segments in females showed two clearly differentiated phases. Estimated maturity size (carapace width) corresponding to 50% mature animals was greater in males than in females. In males, size at the onset of maturity ranged between 31.4 and 35.7 mm, depending on the methods and variables used. The size at the onset of maturity in females ranged between 25.5 and 31.5 mm. In the Ría de Arousa, the size at maturity in females of L. depurator estimated using reproductive criteria is considerably greater than the size found based on morphometric criteria. The size at maturity based on morphometric criteria is greater in males than in females.

Relative growth, life-history phases, and sexual maturity of American lobster (Homarus americanus)

2010 ◽  
Vol 88 (4) ◽  
pp. 347-358 ◽  
Author(s):  
Kim Émond ◽  
Bernard Sainte-Marie ◽  
Louise Gendron
Keyword(s):  
Life History ◽  
Sexual Maturity ◽  
Body Part ◽  
Homarus Americanus ◽  
American Lobster ◽  
Body Parts ◽  
Growth Phases ◽  
Major Life ◽  
Relative Growth ◽  
Cephalothorax Length

Previous studies of relative growth in crustaceans have focused primarily on body parts representing sexual characters for the purpose of determining size at onset of sexual maturity. We have revisited the relative growth of abdomen and crusher claw in American lobster ( Homarus americanus H. Milne Edwards, 1837) in a general life-history perspective using a broad spectrum of lobster sizes (6–160 mm cephalothorax length (CL)). Growth phases were recognized by inflections in scatterplots of a body-part measurement against CL. The abdomen is characterized by three growth phases in the male and female, whereas the crusher claw has at least three growth phases in the male and at least two in the female. Additionally, we explored relative growth of gonopod and vas deferens for males of 35–150 mm CL. Both organs exhibit a synchronous change from strong to weak positive growth allometry. The growth phases can be associated with major life-history events including the transition from a cryptic to an overt lifestyle and the onset of physiological, functional, and morphometric maturity. The onset of morphometric maturation inferred from relative growth of abdomen and crusher claw precedes functional maturity in females and follows it in males.

scholarly journals Morphological variability in populations of the fiddler crab Leptuca uruguayensis (Nobili, 1901) (Crustacea, Decapoda, Ocypodidae) from South America

2017 ◽  
Vol 65 (3) ◽  
pp. 373-381 ◽  
Author(s):  
Setuko Masunari ◽  
Salise Brandt Martins ◽  
Murilo Zanetti Marochi ◽  
Wilson Sebastián Serra ◽  
Fabrizio Scarabino
Keyword(s):  
Posterior Margin ◽  
Sexual Maturity ◽  
Growth Analysis ◽  
Fiddler Crab ◽  
Carapace Width ◽  
Morphological Variability ◽  
Centroid Size ◽  
Relative Growth ◽  
Abiotic Variables ◽  
Major Cheliped

Abstract A comparative study on size and shape of Leptuca uruguayensis was carried out between populations from Garças River, Brazil (BP), and Solís Grande River, Uruguay (UP). The size of the onset of sexual maturity was also estimated for UP. A total of 36 crabs BP and 387 crabs UP were analyzed. In the relative growth analysis, carapace width (CW) for both sexes, major cheliped length (LMC) for males and abdomen width (AW) for females were measured. The centroid size of carapace (1.40±0.19 cm BP and 1.88±0.30 cm UP) and cheliped (1.16±0.22 cm BP and 1.58±0.45 cm UP) differed significantly (p<0.001). The shape also differed significantly (p<0.001), having UP wider carapace than BP, rostrum projected forward and posterior margin positioned more anteriorly; the cheliped of UP was also wider than BP. In UP, males' CW ranged 4.28-19.5 mm and females' 2.53-16.3 mm CW; males' LMC ranged 1.79-31.60 mm and females' AW, 0.80-8.53 mm. The onset of sexual maturity of UP was estimated in 12.20 mm CW for males and 7.81 mm for females. These differences are likely related to abiotic variables acting distinctly in the two localities.

Differential Growth Rate in the Tail of the Pacific Big Skate, Raja binoculata

1971 ◽  
Vol 28 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Peter Ford
Keyword(s):  
Growth Rate ◽  
Gill Filament ◽  
Tail Length ◽  
Analysis Of Covariance ◽  
Differential Growth ◽  
Relative Growth ◽  
The Pacific ◽  
Chronological Sequence ◽  
Total Body ◽  
Differential Growth Rate

Over a period of years the egg cases of Raja binoculata Girard were collected from waters in the Strait of Georgia, British Columbia, and measurements of the total body lengths and tail lengths were recorded. From these data an hypothesis was formulated suggesting that the relative growth rate of the tail to the growth of embryos is related to the mode of respiration utilized at a given time during development.The method of respiration employed by embryos of elasmobranchs follows a chronological sequence of integumentary, external gill filament, and spiracular–branchial respiration. To determine whether this hypothesis was tenable the data were subjected to a statistical analysis. A linear regression on the logarithms of the data was performed for caudal lengths below and above 8.5 cm. In each instance the probability that the resulting slope was not zero was Jess than 0.0001. Further, an analysis of covariance was performed that indicated that the two slopes were significantly different with a probability of less than 0.005.It would seem reasonable on the basis of the above analysis to assume that the tail length-respiration relation is a tenable hypothesis.

scholarly journals Size distribution and sex ratio between populations of the artisanal harvested land crab Cardisoma guanhumi (Decapoda: Gecarcinidae), with the estimation of relative growth and size at sexual maturity in Puerto Rico

2021 ◽  
Vol 69 (3) ◽  
Author(s):  
Jesús D. Quiñones-Llópiz ◽  
Concepción Rodríguez-Fourquet ◽  
Tomás Luppi ◽  
Nahuel E. Farias
Keyword(s):  
Puerto Rico ◽  
Sex Ratio ◽  
Sexual Maturity ◽  
Goodness Of Fit ◽  
Full Range ◽  
Carapace Width ◽  
Growth Patterns ◽  
Relative Growth ◽  
Land Crab ◽  
Cardisoma Guanhumi

Introduction: Knowledge of growth patterns, sex ratio, and sexual maturity are of importance to exploited populations. The land crab Cardisoma guanhumi is an artisanal and subsistence exploited species in Puerto Rico. However, the growth patterns and sexual maturity of the local populations are not known. Objectives: This study has a double objective: (1) to compare the size and sex structure between populations and (2) to model the relative growth of structures related to reproduction to estimate the average size of morphometric sexual maturity (MSM) for both males and females. Methods: A total of 2 849 specimens were captured from nine dispersed populations on the island between 2001 and 2020. Carapace width (CW) was measured as an estimator of the absolute size of all individuals, together with the propodus length (PL) in males and the abdomen width in females (AW). Differences in length structure between sexes and populations were tested by applying goodness-of-fit tests based on Kernel Density Estimators (KDE). The relative growth pattern was modeled adjusting a spline from which the maximum of its second derivative was calculated as an estimator of the MSM, and bootstrapping was used to generate confidence intervals. Results: Differences were found in size structures, between sexes, and between sites. Our estimates of morphometric sexual maturity resulted in a sexual maturity size for males between 57.9 and 79.0 mm CW, while in females, morphological maturity occurs between 43.8 to 51.5 mm CW. Conclusions: We found inter-population differences in body size that can be attributed to differences in the history of changes of land use and the exploitation biased towards larger individuals, though differences in recruitment should also be considered. Current regulations in Puerto Rico protect female crabs but not to larger male crabs. The regulation establishes that crabs smaller than 64 mm carapace width cannot be captured, leaving immature male crabs over 64 mm CW unprotected. We suggest considering different size limits depending on the sex of the crab. This will allow the full range of sizes where sexual maturity is reached to be protected, increasing the likelihood of the population’s size to increase.

scholarly journals Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

2005 ◽  
Vol 48 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Glaucia Dalabona ◽  
Jayme de Loyola e Silva ◽  
Marcelo Antonio Amaro Pinheiro
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Carapace Width ◽  
Southern Brazil ◽  
Monthly Basis ◽  
Ucides Cordatus ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
One Year

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

Growth, maturity and mortality of the blue crab Callinectes arcuatus Ordway, 1863 (Decapoda, Portunidae) in a Mexican coastal lagoon

Crustaceana ◽  
2018 ◽  
Vol 91 (6) ◽  
pp. 659-675
Author(s):  
Perla J. Rivera-Velázquez ◽  
E. Alberto Aragón-Noriega ◽  
Guillermo Rodríguez-Domínguez ◽  
Raúl Pérez-González ◽  
Sergio G. Castillo-Vargasmachuca
Keyword(s):  
Blue Crab ◽  
Sexual Maturity ◽  
Carapace Width ◽  
Maximum Yield ◽  
Individual Growth ◽  
Optimum Level ◽  
Schnute Model ◽  
Size At Sexual Maturity ◽  
The Individual ◽  
Yield Per Recruit

Abstract In Mexico, swimming crabs are considered a strategic resource because it supports artisanal fishing when the main fish resource (shrimp) is in closed season. In “Marismas Nacionales” the blue crab fishery is relatively new, and the catches have been maintained due to the national demand and the availability of the resource. Individual growth, sexual maturity, sexual ratio and mortality were estimated for Callinectes arcuatus for providing information about its population dynamics. Samplings were carried out every 10 days from October 2002 to November 2003. A total of 6022 specimens of C. arcuatus were collected (70.05% were males and 29.95% females) with a maximum carapace width (CW) of 138.5 mm in males and 118.7 mm for females. For males, case 5 of the Schnute model was the best model for describing the individual growth ( and ), while case 2 ( and ) was a better fit for females. The size at sexual maturity was 88.9 mm CW in males (CI = 88-90 mm) and 82.2 mm CW in females (CI = 81.7-82.9 mm). The estimated age at sexual maturity was 0.79 and 0.91 years for males and females, respectively. The male/female sex ratio was 1 : 0.43, significantly different (, ) from the theoretical sexual ratio (1 : 1). Mortality rates in males were , and , and in females they were , and . The exploitation rate indicated the resource is below the optimum level of exploitation and the maximum yield per recruit.

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