scholarly journals Cuttlebone morphometrics and sex identification of Sepia bertheloti (d’Orbigny, 1835) from the central-east Atlantic

2019 ◽  
Vol 73 (1) ◽  
Author(s):  
Airam Guerra-Marrero ◽  
David Jiménez-Alvarado ◽  
Vicente Hernández-García ◽  
Leticia Curbelo-Muñoz ◽  
José Juan Castro-Hernández
Keyword(s):  
Morphometric Analysis ◽  
Growth Pattern ◽  
Gonadal Development ◽  
Sex Identification ◽  
East Atlantic ◽  
Subsequent Increase ◽  
Northwest Africa ◽  
Males And Females

Abstract Analysis of 322 cuttlebones of Sepia bertheloti caught in the waters of the Northwest Africa showed significant differences in growth between males and females. Morphometric analysis revealed a relatively different cuttlebone growth pattern between sexes, with males presenting faster growth in length to reach larger sizes and females displaying greater growth in width. This difference in cuttlebone growth is related to female gonadal development and the subsequent increase of the paleal cavity, providing more support and space to accommodate a higher number of oocytes.

scholarly journals Morphometric analysis of freshwater crab, Potamon koolooense (Decapoda: Brachyura: Potamidae) from hillstream Khoh, Uttarakhand

2013 ◽  
Vol 14 (1&2) ◽  
pp. 55-59
Author(s):  
Shurveer Singh ◽  
Ashish K. Chowdhary ◽  
Anita Rawat Rana ◽  
S.N. Bahuguna
Keyword(s):  
Morphometric Analysis ◽  
Growth Pattern ◽  
Carapace Length ◽  
Regression Equations ◽  
Freshwater Crab ◽  
Allometric Growth ◽  
Monthly Basis ◽  
Anova Test ◽  
Weight Relationship ◽  
Males And Females

The present study was carried out on freshwater crab in hillstream Khoh of district Pauri Garhwal in Uttarakhand state. Samples of crab were collected from the population inhabits the hillstream Khoh on monthly basis during May 2011 to April 2012. The regression equations for the length-weight relationship in crabs were obtained as Y=2.045X+0.266 and Y=1.522X+0.392 for males and females respectively. The ANOVA test revealed significant differences in carapace length-weight relationship at p<0.05 for both the sexes. Allometric growth pattern was observed in the study for both sexes of P. koolooense. A weak relationship was observed between length and weight of the specimen.

scholarly journals Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

2016 ◽  
Vol 14 (4) ◽  
Author(s):  
Tiago Magalhães da Silva Freitas ◽  
◽  
Vitor Hudson da Consolação Almeida ◽  
Luciano Fogaça de Assis Montag ◽  
Nelson Ferreira Fontoura ◽  
...  
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Gonadosomatic Index ◽  
Gonadal Development ◽  
Visual Identification ◽  
Males And Females ◽  
Two Phases ◽  
First Maturity ◽  
Size At First Maturity

ABSTRACT Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L 50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G SI ). L 50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L 50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish.

scholarly journals Multi-aspect testing and ranking inference to quantify dimorphism in the cytoarchitecture of cerebellum of male, female and intersex individuals: a model applied to bovine brains

2020 ◽  
Vol 225 (9) ◽  
pp. 2669-2688
Author(s):  
L. Corain ◽  
E. Grisan ◽  
J.-M. Graïc ◽  
R. Carvajal-Schiaffino ◽  
B. Cozzi ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Data Analytics ◽  
Granule Cells ◽  
Neuronal Cell ◽  
Purkinje Neurons ◽  
Shape Descriptors ◽  
Morphological Pattern ◽  
Depth Analysis ◽  
Viii And Ix ◽  
Males And Females

AbstractThe dimorphism among male, female and freemartin intersex bovines, focusing on the vermal lobules VIII and IX, was analyzed using a novel data analytics approach to quantify morphometric differences in the cytoarchitecture of digitalized sections of the cerebellum. This methodology consists of multivariate and multi-aspect testing for cytoarchitecture-ranking, based on neuronal cell complexity among populations defined by factors, such as sex, age or pathology. In this context, we computed a set of shape descriptors of the neural cell morphology, categorized them into three domains named size, regularity and density, respectively. The output and results of our methodology are multivariate in nature, allowing an in-depth analysis of the cytoarchitectonic organization and morphology of cells. Interestingly, the Purkinje neurons and the underlying granule cells revealed the same morphological pattern: female possessed larger, denser and more irregular neurons than males. In the Freemartin, Purkinje neurons showed an intermediate setting between males and females, while the granule cells were the largest, most regular and dense. This methodology could be a powerful instrument to carry out morphometric analysis providing robust bases for objective tissue screening, especially in the field of neurodegenerative pathologies.

scholarly journals On the identities of Callianassa bouvieri Nobili, 1904, C. maldivensis Borradaile, 1904, and C. gravieri Nobili, 1905 (Crustacea: Decapoda: Callianassidae): a morphometric approach

Zootaxa ◽  
2012 ◽  
Vol 3149 (1) ◽  
pp. 39 ◽  
Author(s):  
PETER C. DWORSCHAK
Keyword(s):  
Morphometric Analysis ◽  
Junior Synonym ◽  
Type Specimens ◽  
Separate Species ◽  
Males And Females

Recent samplings of callianassid shrimp from various habitats, together with the study of type specimens, show that Cal-lianassa gravieri Nobili, 1905 is a junior synonym of Callianassa bouvieri Nobili, 1904. Callianassa maldivensis Borra-daile, 1904, which had been synonymised with the latter, is a separate species. Morphometric analysis of more than 250specimens of these shrimps, which are assigned here to the genus Paratrypaea Komai & Tachikawa, 2008, show that P.bouvieri males and females have unequal chelipeds, whereas P. maldivensis has males with unequal chelipeds and femaleswith equal chelipeds. In addition, both species differ by the presence/absence and size of a median spine on the posteriortelson border. Male P. bouvieri and P. maldivensis are superficially similar but can be differentiated based on numerouscharacters of the major chelipeds, which are illustrated here in detail. The two species occur in different habitats, P. bou-vieri in the intertidal, often near mangroves, P. maldivensis usually sublittoraly near patchy corals. The importance of size and sex when comparing callianassid species is discussed.

Growth pattern and longevity of Parapenaeus fissuroides Crosnier, 1985 (Decapoda, Penaeidae) in Kagoshima Bay, southern Japan

Crustaceana ◽  
2017 ◽  
Vol 90 (2) ◽  
pp. 153-166 ◽  
Author(s):  
Zannatul Farhana ◽  
Jun Ohtomi
Keyword(s):  
Growth Pattern ◽  
Benthic Community ◽  
Carapace Length ◽  
Growth Equation ◽  
Age Group ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Kagoshima Bay ◽  
Males And Females ◽  
Autumn And Winter

Parapenaeus fissuroidesCrosnier, 1985 is an emergent fisheries shrimp resource in the benthic community of Kagoshima Bay. The growth pattern and longevity ofP. fissuroideswere estimated from monthly length-frequency distributions. Carapace length (CL) ranged from 7.7-27.1 mm in males and 6.4-36.1 mm in females. Both males and females were recruited during late autumn and winter. Growth was best described by Pauly & Gaschütz’s growth equation as for males and for females. Females grew faster and reached larger sizes than males of the same age group. The life-span ofP. fissuroideswas estimated to be around 2 years for males and 2.5 years for females.

Beberapa Aspek Reproduksi Siput Lambis lambis di Pesisir Perairan Yenusi, Biak

2016 ◽  
Vol 1 (3) ◽  
pp. 1
Author(s):  
Andriani Widyastuti ◽  
Ludi Parwadani Aji
Keyword(s):  
Sex Ratio ◽  
Management Strategies ◽  
Gonadal Development ◽  
Shell Size ◽  
Gonad Maturity ◽  
Males And Females ◽  
Over Exploitation ◽  
Number Of Males ◽  
Time Of Harvest

<strong>Some Aspects of Reproduction in Conch Lambis lambis of Yenusi Coastal Waters, Biak.</strong> Lambis lambis is a very popular conch species that has been harvested in all sizes encountered. This condition is very alarming because in the long term, its existence in nature will be reduced because there is no chance to reproduce naturally. This study aims to determine the sex ratio and gonad maturity levels of L. lambis in Yenusi waters, so the appropriate time of harvest can be arranged. Samples were collected every month from January to December 2013. Testing and histological analysis were performed in the laboratory. Samples collected were 99 individus with the number of males 45 individus and females 54 individus. The sex ratio of males and females was 1.0:1.2. Gonad maturity level found included all four stages of gonadal development, from TKG I to TKG IV. Gonadal development showed the process of formation and maturation, and the spawning occured throughout the year, with peak spawning in January until March 2013. The size of the shell length obtained ranged from 4.55 to 13.72 cm indicating over-exploitation. Due to the custom local where residents harvested the conches in all sizes found, sustainable management strategies are urgently needed, including moratorium period  when L. lambis is at the peak of spawning, and harvest should only be performed on adult individuals with a minimum shell size of 7 cm, while observing the thickness of the shell and marginal digitations have been formed. <br /><br />

Late Quaternary Climatic Variations in Northwest Africa Deduced from East Atlantic Sediment cores

1976 ◽  
Vol 6 (2) ◽  
pp. 299-314 ◽  
Author(s):  
Liselotte Diester-Haass
Keyword(s):  
Late Quaternary ◽  
Sediment Cores ◽  
Climatic Conditions ◽  
Terrigenous Material ◽  
East Atlantic ◽  
Humid Climate ◽  
Fine Grained ◽  
Senegal River ◽  
Northwest Africa ◽  
High Desert

Characteristic variations in glacial and interglacial periods are shown by the CaCO3 contents, amounts and grain size of terrigenous material (>40 μm), quartz/mica ratios, and desert quartz numbers in East Atlantic sediment cores, collected during Meteor cruise 25 off Sahara and Senegal, 15–27°N. The following results were obtained. During Holocene an arid climate with eolian supply from the continent prevailed throughout the region (fine grained, slight terrigenous input; high CaCO3 values; high desert quartz numbers) except in the Senegal area. Here terrigenous muds indicate river supply and hence humid climate. During upper and lower Würn the climate was humid in the present day Sahara north of 20°N (low desert quartz numbers: input of large quantities of coarse terrigenous material; low CaCO3 values). South of 20°N the climate was arid, the Senegal river input disappeared during upper Würm, desert quartz numbers are as high as in Sahara dune samples, and wind strength was stronger than in the Holocene. Climate during middle Würm resembled Holocene climatic conditions. Climatic conditions during Eem (Riss) were probably similar to those during Holocene (Würm).

scholarly journals Reproducción de los róbalos Centropomus undecimalis y C. ensiferus (Perciformes: Centropomidae) en una laguna costera tropical

2016 ◽  
Vol 65 (1) ◽  
pp. 181 ◽  
Author(s):  
Juan Pablo Gassman ◽  
Héctor López-Rojas ◽  
Dana Padrón
Keyword(s):  
Gonadal Development ◽  
Distribution Area ◽  
Positive Allometry ◽  
Centropomus Undecimalis ◽  
Sequential Hermaphroditism ◽  
Significant Difference ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
Growth Differences ◽  
Fishing Regulations

Snooks C. undecimalis and C. ensiferus are important fishery resources in their distribution area. In Venezuela they are caught by artisanal fisheries along the entire coast. However, studies on their biology that would help establish fishing regulations are scarce. To study reproduction aspects of these species, we analyzed 1 325 individuals of C. undecimalis and 2 025 of C. ensiferus caught by artisanal fishing in the Laguna de Tacarigua in Northern Venezuela, from July 2009 to September 2010. Total length, total weight, sex and stage of gonadal development were recorded. The sex ratio varied throughout the year: there was a significant difference in favor of C. undecimalis males (1.5:1), and C. ensiferus females (1:3.3). Differences were also evident in the sexual proportion at each size group. For both species, males dominated in the lower size ranges while females dominated in the larger size ranges. These results suggested sequential hermaphroditism (protrandry) in both species. Size at sexual maturity (Lm50) for C. undecimalis was ♀= 73.6 and ♂= 59.3 cm, and ♀= 26 and ♂= 21.5 cm for C. ensiferus. C. ensiferus reproduced throughout the year with two periods of higher intensity (August to September and February to April). Although we found very few mature individuals for C. undecimalis, February showed an important reproduction peak. Growth differences were found between males and females of C. undecimalis: positive allometry for females (P= 0.0022*L3.353) and negative allometry for males (P= 0.0108*L2.945). Both males and females of C. ensiferus showed a positive allometric relationship (P= 0.0049*L3.235). Lack of fishing regulations and controls, evidenced in this study by significant volumes of immature individuals in the catches, and the particular reproductive biology of these species, strongly indicates the need to establish regulations to ensure their responsible use. We recommend establishing a closed season during the first quarter of the year and minimum catch sizes for both species.

scholarly journals Growth of the hermit crab Clibanarius vittatus (Bosc, 1802) (Crustacea, Anomura, Diogenidae) at São Vicente, São Paulo, Brazil

2008 ◽  
Vol 51 (3) ◽  
pp. 547-550 ◽  
Author(s):  
Bruno Sampaio Sant’Anna ◽  
Ronaldo Adriano Christofoletti ◽  
Cilene Mariane Zangrande ◽  
Alvaro Luis Diogo Reigada
Keyword(s):  
Growth Pattern ◽  
Hermit Crab ◽  
Sao Paulo ◽  
São Paulo ◽  
Seasonal Growth ◽  
Asymptotic Size ◽  
Clibanarius Vittatus ◽  
Males And Females ◽  
The Mean ◽  
Shield Length

The present study analyzed the growth of males and females of the hermit crab Clibanarius vittatus (Bosc, 1802), at São Vicente, São Paulo, Brazil. Monthly collections were made from May/2001 through April/2003, at the Pescadores Beach in São Vicente. The 2,501 crabs caught were identified and sexed and the carapace shield length (CSL) was measured. For the seasonal growth study, the population was divided into 5mm size classes (CSL) and analyzed by the Bertalanffy method, with the aid of the program Fisat II. The mean sizes of the 703 males and 1,798 females were 8.94±1.80 and 6.61±1.13 mm, respectively. A seasonal growth pattern was observed, with males reaching an asymptotic size (14.92 mm) larger than that of females (13.85 mm). Males began the growth process approximately five months before the females. This growth pattern probably helped to reduce intraspecific competition for the shells, because the males reached larger size and made the smaller shells available to the females.

scholarly journals VALIDATION METRICS OF THE MASTOID TRIANGLE

2013 ◽  
Vol 03 (02) ◽  
pp. 044-045
Author(s):  
Bhagya B. ◽  
Hema N. ◽  
Ramakrishna A.
Keyword(s):  
Sex Identification ◽  
Mastoid Process ◽  
P Values ◽  
Validation Metrics ◽  
Males And Females ◽  
The Mean ◽  
The Right ◽  
Heron’S Formula

AbstractThe purpose of this study was to validate the technique developed by Paiva and Segre for sex identification using the mastoid process. Total mastoid area is calculated by adding the right and left triangular areas defined by three distinct craniometric points: the Asterion, Porion and the Mastoidale. Eight skulls (40 males and 40 females) were analysed and total area calculated using Heron's formula. The mean total area of the male skulls is higher compared to females (1461.06 mm2 vs 1222.79 mm2). Independent t-tests reveal that there are significant differences between males and females, with p-values less than 0.0001.

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