scholarly journals Sexual maturity of the small shrimp Potimirim brasiliana Villalobos, 1959 (Crustacea, Atyidae), from the southeastern coast of Brazil

2020 ◽  
Vol 17 (1) ◽  
pp. 1-14
Author(s):  
Marina Machado da Costa ◽  
Patrícia Hoffmann ◽  
Geslaine Rafaela Lemos Gonçalves ◽  
Maria Lucia Negreiros-Fransozo
Keyword(s):  
Sexual Maturity ◽  
Carapace Length ◽  
Logistic Equation ◽  
Brazilian Coast ◽  
Reproductive Process ◽  
Relative Growth ◽  
Demographic Groups ◽  
Southeastern Coast ◽  
Organic Debris ◽  
Appendix Masculina

The shrimp Potimirim brasiliana plays an important role in streams along the Brazilian coast as it feeds on the organic debris from the surrounding ecosystem. We determined the morphological sexual maturity of P. brasiliana by means of relative growth. Monthly throughout a year, we used sieves (2 mm mesh diameter) to collect the specimens in a coastal stream. A total of 3,521 specimens had their carapace length (CL) measured, as well as their second pleura length (PL) and the length (AML) and width (AMW) of the appendix masculina. The studied relationships were the following: CL vs. PL; CL vs. AML and CL vs. AMW, with the data adjusted to a logistic equation. All the relationships tested among the demographic groups differed statistically. The CL50 of females measured 3.45 mm, while the CL50 of males measured 2.75 mm. Two adult morphological groups were set apart for each sex. The CL vs. AMW relationship is the best at demonstrating the separation of the morphological groups for males. This fact is an intriguint issue as it suggests the presence of morphotypes in males, probably, playing different roles in the reproductive process.

scholarly journals A comparison of the allometric growth in Uca leptodactyla (Crustacea: Brachyura: Ocypodidae) from two subtropical estuaries

2004 ◽  
Vol 84 (4) ◽  
pp. 733-735 ◽  
Author(s):  
Rosana Carina Flores Cardoso ◽  
Maria Lucia Negreiros-Fransozo
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Brazilian Coast ◽  
Allometric Growth ◽  
Size At Sexual Maturity ◽  
Subtropical Estuaries ◽  
Habitat Similarity

The allometric growth of Uca leptodactyla from two distinct subtropical estuaries on the Brazilian coast was evaluated concerning its growth pattern and size at onset of sexual maturity. Females attained maturity at similar sizes in both sites (4·1 mm of carapace length in Indaiá and 4·2 mm in Ubatumirim), while males differed slightly. They reached the size at sexual maturity of 5·3 mm of carapace length in Indaiá and 4·6 mm in Ubatumirim. Growth pattern is usually similar among crabs from distinct sites while size at sexual maturity is frequently different. However, in the case of U. leptodactyla it did not occur, probably due to the strong habitat similarity and intrinsic features of this species.

scholarly journals Relative growth of freshwater prawn Macrobrachium brasiliense (Decapoda, Palaemonidae) and its implications for reproduction

2019 ◽  
Vol 109 ◽  
Author(s):  
Caio dos Santos Nogueira ◽  
Marcela Silvano de Oliveira ◽  
Giuliano Buzá Jacobucci ◽  
Ariádine Cristine de Almeida
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Freshwater Prawn ◽  
Relative Growth ◽  
Guarding Behavior ◽  
Males And Females ◽  
One Year ◽  
Almost All

ABSTRACT The main objective of this study was to estimate the morphological sexual maturity of Macrobrachium brasiliense (Heller, 1862) and to analyze the relative growth of the species. During one year of sampling, from July 2012 to June 2013, 199 specimens were collected in a stream located in a Cerrado biome, in the Triângulo Mineiro region, state of Minas Gerais. Once identified and sexed, the length of the carapace, the length of the segments of the chelipeds (ischium, merus, carpus, propodus and dactyl) and width of the pleura were measured (mm). The maximum and mean sizes of the carapace length measured 20.5 mm (Mean: 9.6 ± 4.2 mm) and 20.1 mm (Mean: 7.7 ± 3.4 mm) for males and females, respectively. The propodus length for males, and the pleura width for females, were used for the classification of the specimens into juvenile and adult, using K-means analysis and discriminant analysis. The relative growth of the species was also evaluated through covariance analysis for all structures (ANCOVA, α = 0.05). In females, the growth of most structures occurred equally between juveniles and adults, with the exception of the merus and pleura structures. On the other hand, the growth of almost all structures of males differed between juveniles and adults. Only the carpus and the pleura growth were similar. We also estimated the size at onset of morphological sexual maturity at 8.64 mm CL for males (CL50% r = 1.71) and 8.03 mm CL for females (CL50% r = 0.07). Our results contribute to the understanding of some important questions related to the reproductive biology of M. brasiliense. We noted that males grow differently from females and become the largest individuals in the population, resulting in a sexual dimorphism. Such sexual dimorphism might promote the development of the temporary mating guarding behavior, a reproductive strategy very important for caridean shrimps.

Reproductive biology of the slipper lobster Scyllarides deceptor (Decapoda: Scyllaridae) along the southern Brazilian coast

2008 ◽  
Vol 88 (7) ◽  
pp. 1433-1440 ◽  
Author(s):  
Gabriela Oliveira ◽  
Andrea S. Freire ◽  
Paulo R.K. Bertuol
Keyword(s):  
Reproductive Biology ◽  
Breeding Season ◽  
Sexual Maturity ◽  
Egg Size ◽  
Carapace Length ◽  
Sampling Period ◽  
Late Winter ◽  
Brazilian Coast ◽  
Rocky Bottom ◽  
Size At Sexual Maturity

The reproductive biology of Scyllarides deceptor was studied along the southern Brazilian coast (27°S 48°W) from December 2002 to December 2003. Samples were collected monthly at Xavier Island, where animals were caught and marked. Fecundity and egg size were estimated from ovigerous females caught also in two adjacent islands, Arvoredo and Aranhas. A total of 98 females was recorded at Xavier Island during the sampling period, 24 of these were recaptured and presented time-at-liberty ranging from 14 to 297 days. Ovigerous females were observed during spring and summer, with the moulting period lasting from late winter to spring. Size at sexual maturity was assessed from 66 females caught during the breeding season and estimated in 85.33 mm of carapace length (CL). Mean fecundity of S. deceptor was estimated in 191,262 eggs (±17,811, SE) for females, on average, 94.74 mm long (±1.86 mm SE) (CL). Fecundity was significantly related to CL (R2 = 0.90) Mean egg size was 0.67 mm (±0.005 mm SE) and did not correlate significantly to CL (P = 0.78). The rocky bottom of Xavier Island was favourable for reproduction, presenting shelter and foraging grounds for the ovigerous females. For management purposes, our results suggest the closure of the S. deceptor fishery from November to January and the capture-size of females to be restricted to animals larger than 90 mm (CL).

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.

scholarly journals Studies on the allometric growth of the caramote prawn Melicertus kerathurus (Decapoda, Penaeidae) in Western Greece (E. Mediterranean)

2009 ◽  
Vol 10 (1) ◽  
pp. 25 ◽  
Author(s):  
K. KAPIRIS ◽  
E. KALLIAS ◽  
A. CONIDES
Keyword(s):  
Carapace Length ◽  
Western Mediterranean ◽  
Body Parts ◽  
Allometric Growth ◽  
Metabolic Processes ◽  
Maximum Width ◽  
Relative Growth ◽  
Appendix Masculina ◽  
Males And Females ◽  
Western Greece

The relative growth of eleven body parts (carapace length, height, width, abdominal length, height and width, rostral length and telson length) of males and females of the caramote prawn Melicertus kerathurus was studied in samples from the Amvrakikos Gulf (Western Greece, E. Mediterranean). In addition to this, the relative growth of the length and the maximum width – and consequently the surface - of the appendix masculina of males was also studied. In general, both sexes showed similar patterns of relative growth. However, the females’ body appendages were significantly greater than those of the males. A negative allometry of escaping appendages (telson), abdomen (related to the metabolic processes, rapid locomotion and reproduction), rostrum, appendix masculina (related to mating and sperm transfer) and carapace height and width was found in both sexes. The biometric studies in this species in the central and western Mediterranean are in agreement with those from the eastern part of the basin, suggesting that all the populations throughout the Mediterranean could be considered as uniform.

scholarly journals Relative growth and morphological sexual maturity of Chasmagnathus granulatus (Crustacea, Varunidae) from a mangrove area in southeastern Brazilian coast

2007 ◽  
Vol 97 (3) ◽  
pp. 268-272 ◽  
Author(s):  
Rafael Augusto Gregati ◽  
Maria Lucia Negreiros-Fransozo
Keyword(s):  
Sexual Maturity ◽  
Body Height ◽  
Allometric Equation ◽  
Brazilian Coast ◽  
Body Parts ◽  
Positive Allometry ◽  
Relative Growth ◽  
Males And Females ◽  
First Time ◽  
Chasmagnathus Granulatus

The relative growth and morphological sexual maturity of Chasmagnathus granulatus Dana, 1851 are presented for the first time to a mangrove population. The crabs were obtained during low tide periods, in the mangrove of Jabaquara Beach, Paraty, Rio de Janeiro, Brazil. All crabs in intermolt stage were sexed and had their body parts measured as follows: body height (BH), carapace length (CL) and width (CW), major cheliped propodus height (PH) and length (PL) for each sex, gonopod length (GL) and abdomen width (AW) for males and females, respectively. The relative growth was described using the allometric equation y=ax b and the size at onset sexual maturity was achieved using the software Mature I. The size of specimens ranged from 4.1 mm to 39.5 mm CW. The growth pattern was different between sexes in the cheliped relationships; the relationships BH vs. CW evidenced positive allometry for juveniles; PL vs. CW and PH vs. CW positive allometry for most crabs except juvenile females; AW vs. CW and GL vs. CW evidenced positive allometry for juveniles and isometry for adults. The relationships that best indicated the change from the juvenile to the adult phase were PH vs. CW for males and AW vs. CW for females. The size in which 50% of males from this population are mature is at 19.7 mm of CW (F=144.14; p<0.05) and for females it is at 19.2 mm of CW (F=166.54; p<0.05). The sizes obtained in this mangrove population are larger than those from previous studies, that could be attributed to a species plasticity concerning the habitat structure.

scholarly journals Population dynamics, relative growth and sex change of the protandric simultaneous hermaphroditeExhippolysmata oplophoroides(Caridea: Lysmatidae) close to an upwelling area

2017 ◽  
Vol 98 (4) ◽  
pp. 727-734 ◽  
Author(s):  
Régis A. Pescinelli ◽  
Thiago M. Davanso ◽  
João A. F. Pantaleão ◽  
Abner Carvalho-Batista ◽  
Raymond T. Bauer ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Sex Change ◽  
Reproductive Period ◽  
Simultaneous Hermaphrodite ◽  
Relative Growth ◽  
Demographic Groups ◽  
Appendix Masculina ◽  
Body Sizes ◽  
Male Phase

The present study investigated the population dynamics ofExhippolysmata oplophoroidesin an area influenced by upwelling, focusing on reproductive period, sex ratio, growth rate, longevity, mortality, relative growth and size of sex change. We also tested the hypothesis that the appendices internae increased in size with sex change from the male to the simultaneous hermaphrodite phase as possible replacements for the male appendices masculinae, which are reduced or lost at sex change. Population structure was assessed by the distribution of size frequency in three demographic groups: male phase, hermaphrodite phase with, and without embryos. For relative growth analysis, the length of the following structures was measured: carapace, second pleuron, first pereopod, second pereopod, appendices internae of the second to fifth pleopods, and appendix masculina. Smaller size classes were composed only by male-phase individuals. The sex ratio was significantly biased towards the simultaneous hermaphrodite phase. Reproduction was continuous in the population throughout the year. Slower growth rates but higher maximum body sizes than those estimated at other locations in south-eastern Brazil were observed in the population studied. Cooler temperatures and higher nutrient levels associated with upwelling may have produced this pattern of reproduction and growth, similar to that found in more southerly austral latitudes. We also found that sex change influences the relative growth of body structures such as the second pereopods, appendices internae, and appendix masculina, and hypotheses on the adaptive value of such allometric growth are proposed.

scholarly journals Relative growth and sexual maturity of the freshwater shrimp Palaemon pandaliformis (Crustacea, Palaemonidae) in northeastern of Brazil (Canavieiras, Bahia)

2013 ◽  
Vol 103 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Lucas R. P. Paschoal ◽  
Fernanda J. Guimarães ◽  
Erminda C. G. Couto
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Ovigerous Female ◽  
Global Scale ◽  
Northeastern Brazil ◽  
Species Comparison ◽  
Relative Growth ◽  
Significant Difference ◽  
Freshwater Environments

This study comprises the description of relative growth and sexual maturity of a population of Palaemon pandaliformis Stimpson, 1871 in Salsa River (Northeastern Brazil). Samples were collected monthly between September 2009 and August 2010. Females were larger, heavier, and showed a greater allometric coefficient (b) than male specimens. Only carapace length vs. pleura length in females presented a significant difference in the relative growth pattern, indicating a puberty moult. This relationship is strictly correlated to reproduction and its success rate in female shrimps. Estimated carapace length in 50% of mature females (CL50) was 4.53 mm. It was not possible to compare obtained CL50 results due to a lack of studies on this species. Comparison was based on the size of the smallest captured ovigerous female (3.81 CL mm), which is within the scope of recorded size for estuaries located in higher latitudes. This study reveals the lack of research on this genre in freshwater environments on a national and global scale.

Relative growth and sexual maturity of the pandalid shrimp Plesionika izumiae (Decapoda, Caridea) in Kagoshima Bay, southern Japan

Crustaceana ◽  
2014 ◽  
Vol 87 (13) ◽  
pp. 1567-1577 ◽  
Author(s):  
F. Ahamed ◽  
F. Ahamed ◽  
J. Ohtomi
Keyword(s):  
Carapace Length ◽  
Least Squares Method ◽  
Small Scale ◽  
Allometric Growth ◽  
Relative Growth ◽  
Secondary Sexual Characters ◽  
Kagoshima Bay ◽  
Southern Japan ◽  
Appendix Masculina ◽  
Secondary Sexual

The pandalid shrimp Plesionika izumiae Omori, 1971 is widely distributed in the west Pacific region. This is a relatively common shrimp in the coastal waters of Japan, except off northern Honshu and Hokkaido, and it is commercially important for small-scale bottom seine fishery. The relative growth of secondary sexual characters (appendix masculina for the male and abdomen width for the female) of P. izumiae was studied in Kagoshima Bay, southern Japan, from December 2009 to November 2011. The length of the appendix masculina was measured for males, while abdomen width near the second pleopod was measured for females. The relationships between carapace length and the observed secondary sexual characters were studied using the least squares method. The appendix masculina showed positive allometric growth in relation to carapace length (CL), showing discontinuities at 7.3 mm CL. The width of the female abdomen showed positive allometric growth with CL, while indicating a discontinuity at 8.6 mm carapace length. The observed discontinuities in the growth rate of secondary sexual characters of P. izumiae might be attributed to sexual maturation.

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