scholarly journals Allometric Growth of the Freshwater Crab Potamon algeriense (Bott, 1967) (Decapoda, Brachyura, Potamidae) in Oued Zegzel, a Mountain Stream, in the Northeast of Morocco

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Soufiane Fadlaoui ◽  
Mohammed Mahjoub ◽  
Ouahid El Asri ◽  
Mohammed Melhaoui
Keyword(s):  
Sexual Maturity ◽  
Carapace Width ◽  
Growth Patterns ◽  
Mountain Stream ◽  
Morphometric Study ◽  
Body Parts ◽  
Freshwater Crab ◽  
Left Handed ◽  
Wet Weight ◽  
One Year

A morphometric study has been carried out for the first time on the population of the freshwater crab Potamon algeriense inhabiting Oued Zegzel, a tributary of the Lower Moulouya River, in the northeast of Morocco. Crabs were collected monthly over one year (October 2017 to September 2018) by excavating burrows and searching under blocks. A total of 669 crabs were obtained, 291 females and 378 males. Regression analysis was performed among carapace width (CW), as the reference dimension, and wet weight (WW), carapace length (CL), length and width of abdomen (AL and AW), and length and width of the cheliped (ChL and ChW) were chosen as dependent variables, using the allometric method. Based on Somerton’s technique, the onset of sexual maturity was estimated to occur at around 27mm CW for males and 32mm CW for females. The growth patterns recorded for P. algeriense are associated with the species reproductive strategy, i.e., preparation of body parts involved in female acquisition and egg incubation, like the male cheliped and the female abdomen, respectively. Among the 291 females sampled, 10.20% were left-handed and 89.80% were right-handed, while among the 378 males examined, 10.32% were left-handed and 89.68% were right-handed. It was concluded that the cheliped width and the abdominal width of P. algeriense are the morphometric variables most appropriate to estimate the size at the beginning of the sexual maturity for males and females of this species, respectively.

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.

scholarly journals Diet composition of freshwater crab, Potamon koolooense Rathbun, 1904 from hillstream of Uttarakhand

2016 ◽  
Vol 8 (1) ◽  
pp. 301-304 ◽  
Author(s):  
S. N. Bahuguna ◽  
Anita Rawat Rana ◽  
Shurveer Singh
Keyword(s):  
Diet Composition ◽  
Feeding Habits ◽  
Carapace Width ◽  
Stomach Content Analysis ◽  
Mountain Stream ◽  
Freshwater Crab ◽  
Food Groups ◽  
Stream Communities ◽  
Plant Matter ◽  
Significant Difference

The present study was carried out to study the diet composition of freshwater crab, P. koolooense in hillstream Khoh of Uttarakhand during November, 2013 to October, 2014. Total 105 crab samples were used for the study, 35 male and 47 female were found with food in their stomach while rest of the 23 had empty stomachs. The carapace length (CL) ranged from 12mm to 49mm, carapace width (CW) from 15mm to 59mm and total weight (TW) from 2.08g to 60.12g. Stomach content analysis of the animal showed that the diet of the animal composed of animal matter, plant matter, algae, fungi, debris and unidentified materials. Animal matter ranged from (3.27-11.93%), plant matter (4.37-14.44%), algae (1.73-6.15%), fungi (0.17-1.43%), debris (28.18-40.47%) and unidentified materials (36.46-50.05%) in males while in the female animal matter ranged from (3.09-12.34%), plant matter (4.45-12.73%), algae (1.03-7.61%), fungi (0.02-3.34%), debris (23.18-43.34%) and unidentified (30.31-51.04%). Unidentified materials recorded maximum and fungi recorded minimum in both the sexes of Potamon koolooense. A significant difference was observed at p<0.05 between food groups- algae and unidentified matter in both sexes. This is the first report, to key out and quantifies the dietary items and feeding habits of crab in Uttarakhand which would be helpful in interpreting the ecological niche of the animal in mountain stream communities.

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.

Relative Growth and Its Use to Determine the Morphological Sexual Maturity of Ucides Cordatus (Linnaeus, 1763) (Decapoda, Brachyura, Ucididae) from Two Mangrove Areas on the Northeastern Brazilian Coast

Crustaceana ◽  
2011 ◽  
Vol 84 (10) ◽  
pp. 1221-1241 ◽  
Keyword(s):  
Sexual Maturity ◽  
Carapace Width ◽  
Reproductive Behaviour ◽  
Brazilian Coast ◽  
Positive Allometry ◽  
Relative Growth ◽  
Ucides Cordatus ◽  
Males And Females ◽  
One Year ◽  
Major Cheliped

AbstractThe study of relative growth was used to determine the dimensions that best demonstrate the morphological sexual maturity of Ucides cordatus from two mangrove areas (Ariquindá and Mamucabas) of the southern coast of the state of Pernambuco, northeast Brazil. The crabs were collected manually, with a capture effort by one person, during low tide in three different areas (each 25 m2) during a period of one year from April 2008 to March 2009. Crabs of both sexes were measured for the following dimensions: carapace width (CW); carapace length (CL); major cheliped propodus length (CPL); major cheliped propodus height (CPH); abdomen width (AW) and gonopod length (GL). These variables were subjected to an analysis of K-means clustering followed by a bivariate discriminant analysis, which separated the data into two groups: juveniles and adults. After separation of the groups, each age category was grouped into sixteen size classes of CW and the proportion of adults in each size class was calculated, and fitted to a logistic equation. Subsequently, an interpolation was performed to determine the size at which 50% of the males and females were mature. The relationships that best demonstrated the size at maturity were CPL vs. CW for males (Positive allometry; Ariquindá — juveniles b = 1.27, adults b = 1.41; Mamucabas — juveniles b =1.27, adults b = 1.44) and AW vs. CW for females (Positive allometry; Ariquindá — juveniles b = 1.34, adults b = 1.28; Mamucabas — juveniles b = 1.32, adults b = 1.44). The present analysis indicates that, for these same relationships, 50% of males and females are morphologically mature, at, respectively, 38.0 and 35.4 mm CW in Ariquindá, and 37.3 and 32.9 mm CW in Mamucabas. Positive allometry shown in the female abdomen is related to egg incubation, and the excessive growth observed in the male cheliped must be related to reproductive behaviour, including courtship and intra- or inter-specific agonistic interactions with other males.

Ovarian development in the freshwater crab Goyazana castelnaui (H. Milne Edwards, 1853) (Brachyura, Trichodactylidae)

Crustaceana ◽  
2021 ◽  
Vol 94 (2) ◽  
pp. 131-139
Author(s):  
F. R. V. Freita ◽  
A. P. Pinheiro ◽  
R. A. Gregati
Keyword(s):  
Sexual Maturity ◽  
Ovarian Development ◽  
Histological Analysis ◽  
Carapace Width ◽  
Microscopic Analysis ◽  
The State ◽  
Semiarid Region ◽  
Freshwater Crab ◽  
Development Stages ◽  
Regional University

Abstract The aim of the present study was to describe the stages of ovarian development in the eubrachyuran crab Goyazana castelnaui through macroscopic and microscopic analyses and estimate size at physiological sexual maturity. Four ovarian development stages have been defined in the 60 G. castelnaui females that were analysed from the São Pedro River in the municipality of Ouricurí (semiarid region of the state of Pernambuco, Brazil), between November 2011 and October 2012. The crabs were collected and sent to the Semiarid Crustaceans Laboratory of the Cariri Regional University. Each specimen was measured. Ovaries were classified using a visual scale, removed with needle-nose pincers, fixed, and processed for microscopic analysis. Gonad stages were determined macroscopically using a staining process and were confirmed by histological analysis (initial, intermediate, mature and spawned). Size at physiological sexual maturity was determined to be 37.67 mm carapace width for females of this species.

scholarly journals Gonadal development in the freshwater crab Sylviocarcinus pictus (H. Milne Edwards, 1853) (Brachyura: Trichodactylidae) from the Guamá river, state of Pará, Brazil

2012 ◽  
Vol 84 (3) ◽  
pp. 789-798 ◽  
Author(s):  
Leiliane S. Silva ◽  
Jussara M. Martinelli-Lemos ◽  
Maria Auxiliadora P. Ferreira ◽  
Rossineide M. Rocha
Keyword(s):  
Sexual Maturity ◽  
Histological Analysis ◽  
Carapace Width ◽  
Gonadal Development ◽  
Rapid Identification ◽  
Freshwater Crab ◽  
Follicular Cells ◽  
Development Stages ◽  
Size At Sexual Maturity ◽  
Ovulatory Follicles

The development stages of male and female gonads in the freshwater crab Sylviocarcinus pictus (H. Milne Eduards, 1853) were described through macroscopic and microscopic (histology) examinations. The histological description was based on 40 specimens (20 each sex). Four gonadal development stages were found for females: immature, ripening, mature and spawned. The following female cells were found: ovogonia, oocytes in initial vitellogenesis, oocytes in advanced vitellogenesis, follicular cells and post-ovulatory follicles. Three development stages were found for males: immature, maturing and mature, with the indication of: spermatogonia, spermatocytes, spermatids, spermatozoids and spermatophores. These data suggest the pattern described in the literature. Size at sexual maturity was 32.3 mm of carapace width for males and 31.5 mm for females. The gonadal stages observed macroscopically by volume and color were validated through histological analysis and proved to be useful method for the rapid identification of sexual maturity in the species. The present study offers previously unpublished data on the reproductive biology of Sylviocarcinus pictus.

scholarly journals Morphological and Morphometric Study of the Supratrochlear Foramen

2018 ◽  
Vol 35 (01) ◽  
pp. 54-57
Author(s):  
F.A. Silva ◽  
T.S. Silva ◽  
P.R.F.B. Souza ◽  
R.S. Reis ◽  
M.R.S. Ferreira ◽  
...  
Keyword(s):  
Distal Humerus ◽  
Distal Portion ◽  
Medullary Canal ◽  
Human Bone ◽  
Morphometric Study ◽  
Left Handed ◽  
Academic Center ◽  
Preoperative Procedures ◽  
The Mean ◽  
The Right

Introduction The supratrochlear foramen (SF) is located in the distal portion of the humerus, formed in between the coronoid fossa and the olecranon fossa. Is associated with a narrowing of the medullary canal in the distal humerus, in addition to being a phylogenetic characteristic, more common in ancient populations. The objective was to evaluate the incidence of the supratrochlear foramen, it's shape, dimensions and translucency of the septum. Materials and Methods A total of 141 humerus adults, 72 right and 69 left-handed individuals from the collection of the Human Bone of the Academic Center of Vitória-Brazil. The format was classified as oval, round, irregular and cribriform. The vertical (VD) and transversal (TD) diameter were measured and the translucency of the septum was observed. Results Of the 141 humerus, 19.8% (28) had SF 39.3% (11) on the right side and 60.7% (17) on the left side. The oval was the most recurrent, found in 39% of the cases and the translucency was identified in 78% (110) of the bones. The mean VD was 3.653 mm and 3.492 mm on the right and left sides, respectively. The mean of the TD was 4.853 mm on the right side and 5.427 mm on the left. The area averages were 19.633 ± 20.57 mm2 on the right side and 19.919 ± 19.24 mm2 on the left side. Conclusion The knowledge of SF favors the preoperative procedures of patients with fractures in the distal humerus, necessary for the surgeries in the region.

scholarly journals Mollusc fisheries and length–weight relationship in Tonle Sap flood pulse system, Cambodia

2018 ◽  
Vol 54 ◽  
pp. 34 ◽  
Author(s):  
Peng Bun Ngor ◽  
Ratha Sor ◽  
Leang Hour Prak ◽  
Nam So ◽  
Zeb S. Hogan ◽  
...  
Keyword(s):  
Annual Variation ◽  
Flood Pulse ◽  
Growth Patterns ◽  
Water Levels ◽  
Relationship Analysis ◽  
Weight Relationship ◽  
Daily Data ◽  
Tonle Sap ◽  
Mollusc Species ◽  
One Year

Molluscs are important for ecological function, livelihoods and fisheries, but are often forgotten in research and management. Here, we investigated intra-annual variation in the landing and growth patterns of three mollusc species, i.e., Corbicula moreletiana, Pila virescens and Pila ampullacea, using one-year daily data on landing catches and values, recorded in Kampong Chhnang province of Tonle Sap (TS) Lake. Overall, 8330 tonnes with a first sale landing value of US$ 1.4 million for the three species were reported. Also, we found that C. moreletiana was abundant during the dry season with high temperature and less precipitation. By contrast, the two Pila species were abundant from the early rainy to early dry seasons when precipitation and water levels increase. The length–weight relationship analysis indicated that a faster growth in weight of Pila species occurred in the rainy season, and a general negative allometric growth was observed for the three species. This implies that their populations were intensively fished. Our preliminary results suggest that molluscs in the TS Lake (i) are important resources in support of people's livelihoods, (ii) respond differently to intra-annual variation in temperature, precipitation and hydrology and (iii) are being intensively exploited with significant reduction in growth rate. Therefore, it is necessary to conduct further comprehensive research describing status of mollusc stocks and their ecology to support long-term management and conservation of this important aquatic fauna. Our study contributes to establishing the first important baseline data and information on key mollusc species for the TS.

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.

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