#morphometry

[oaresearchpaper]

Species identification is becoming a difficult task when there is a very little difference among them. In crustaceans things are more complicated as because they are quiet similar in appearance. To identify and differentiate between two sympatric freshwater prawn Macrobrachium lamarrei and M. lanchesteri in the northwestern Bangladesh collection of experimental samples were done from three different rivers from three different districts. Morphometric and meristic characters were applied for species recognition and statistical analyses were conducted to differentiate the prawn species. ANOVA (One way analysis of variance) was conducted at 5% level of significance to compare the values of 22 morphometric and4 meristic characters. The ANOVA showed the difference significantly at p>0.001, 0.01 and 0.05 in 15 morphometric and 3 meristic characters. To understand variation PCA (Principal Component analysis) and DFA (Discriminant Function Analysis) were tested. PCA products produced three components describing 71.77% variation due to 15 of 22 morphometric characters. The discriminate scores separated and correctly classified the two species. Hierarchical cluster analysis also distinguished the two species into two separate clusters. However, reliable molecular study needed for more authentications to differentiate species due to morphological plasticity. This study, by differentiating and correctly identifying of these species, will be helpful to conduct research in future.

[mbimphblog]

MORPHOMETRIC TRAITS OF Apis dorsata WORKER BEES OF JOGIMATTI FOREST AND CHITRADURGA. KARNATAKA – INDIA | UTTAR PRADESH JOURNAL OF ZOOLOGY

The freshwater garfish, Xenentodon cancila (Hamilton, 1822), is a needlefish species found in freshwater and brackish areas in South and Southeast Asia. This fish is a regular aquarium favourite. While these fish are linked to the marine needlefish known as gar or garpike in Europe, they are far more distantly connected to other fishes known as gars. For the first time, Trichodina cancilae Asmat, 2001 was discovered parasitizing the gills of a freshwater fish known as Kokila in Assam, India (X. cancila Hamilton, 1822). T. cancilae morphology and morphometrics are discussed here, along with a comparison of the same species found in West Bengal and Bangladesh. This Trichodina species lies within the morphometric range and shares the original population's overall look of the sticky disc.

Please see the link :- http://mbimph.com/index.php/UPJOZ/article/view/2254

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MORPHOMETRIC COMPARISON OF CHARACIDAE FISH WHEN n < p | UTTAR PRADESH JOURNAL OF ZOOLOGY

External morphology has recently received a lot of attention, particularly in fish, when it comes to identifying hybrids. This paper compares morphological covarion patterns between specimens of Colossoma macropomum and the hybrid C. macropomum () x P. orinoquensis () using a LASSO model based on the truss protocol. In this analysis, 25 C. macropomum specimens and 20 hybrid C. macropomum () x P. orinoquensis () specimens were examined, respectively. Strauss and Bookstein (1982) used the "Truss protocol" or "trusses" form. The mean squared error of the LASSO model was reduced. Just seven covariates are present in the final model. The morphological covariation patterns between specimens of C. macropomum and the hybrid C. macropomum () x P. orinoquensis () were well matched by the LASSO model, allowing most of the specimens to be correctly classified. Covariates associated with hydrodynamic abilities and foraging revealed differences in the region of the head and the anterior part of the fish. Morphometry is the science of determining the shape of something. Please see the link :- https://mbimph.com/index.php/UPJOZ/article/view/1849

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ON A LOGISTIC MODEL FOR MORPHOLOGICAL COVARIATION PATTERNS BETWEEN Colossoma macropomum AND THE HYBRID Colossoma macropomum (♀) x Piaractus orinoquensis (♂) | UTTAR PRADESH JOURNAL OF ZOOLOGY

Currently, great importance has been given to the study of external morphology, especially in fish, when it is used as a means of identifying hybrids. This paper considers a multiple logistic regression model based on the truss protocol to compare morphological covariation patterns between specimens of C. macropomum and the hybrid C. macropomum (♀) x P. orinoquensis (♂). In this study, 25 specimens of C. macropomum and 20 specimens of the hybrid C. macropomum (♀) x P. orinoquensis (♂), respectively, were analyzed. The method "Truss protocol" or "trusses" was used. Multiple logistic regression model based on the morphological covariation patterns between the two species showed a good fit and allowed to correctly classify most of the specimens. Only two covariates were significant; eye diameter and fat fin base. Differences between the hybrid and its parent were observed in the head area and in the anterior part of the fish, which were associated with hydrodynamic abilities and with foraging. Please see the link :- https://mbimph.com/index.php/UPJOZ/article/view/1720

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SPECTRUM OF SEASONAL SURVEY OF HELMINTH PARASITES OF FRESHWATER FISHES FROM UTTAR PRADESH, INDIA

The worldwide-distributed well-known piscian helminth parasitic fauna viz., nematodes, trematodes and cestodes were collected from listed sampling stations of Uttar Pradesh, India during 2017-18 to 2018-19. The fieldwork report summarizes the computed recorded data of Incidence, Intensity, Density and Index of infection of helminth parasites from freshwater fishes. In this survey, biostatistical analysis with population dynamics of Caryophyllidae has observed in local freshwater fish species of different regions of the Uttar Pradesh, India. the present study deals with the annual cyclic seasonal survey of helminth parasites with the paratenic host. For this study, the freshwater fishes were collected from different districts and tehsils of Uttar Pradesh state viz., Garhmukteshwar, Anoopshahr, Agra, Etawah, Kanpur, Prayagraj, Banaras, Sultanpur. Out of 400 freshwater fishes, 153 was found infected with helminth parasites in which nematodes, trematodes and cestodes were observed in an annual cycle of seasonal spectrum. During this survey period, a total of four types of piscian parasites identified from different fish species after the microscopic investigation in the laboratory followed by the key standards and measurement of classification. Physical disadvantages checked on the host fish from parasitic infestation during the lab's microscopic and morphometrical investigation. Additional parasites also collected and preserved for further investigation. These parasites species were classified and distributed in different higher taxa viz., Platyhelminthes- Trematoda, Cestoda, Aschelminthes- Nematoda and Acanthocephala. Morphological and morphometrical study of parasites is more helpful to identify different species of piscian parasites with external form. During the present investigation, the Influence of seasons on parasitic infection was recorded within three seasons as Rainy, Winter and Summer. Regarding the    parasitic diversity and population dynamics study has been carried out to compare each other. This study highlights the details of the biostatistical configuration and morpho-taxonomical analysis of endoparasitic organisms infecting freshwater fishes along with listed sampling stations of Uttar Pradesh state. The result suggests that assemblages of helminth parasites in freshwater fish are not random collections of locally available species, but rather structured clusters of larval parasites that travel together along common transmission pathways.

Please read full article : - www.mbimph.com

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Sreelekshmi S, Benno Pereira F G, Binil V Shijith Department of Aquatic Biology and Fisheries, University of Kerala, Kerala, India Department of Zoology, University of Kerala, Kerala, India Key words: Devario species, Morphometry, Length- weight relationship, Condition factor, Cyprinids

Abstract

Morphometric parameters, length-weight relationship and condition factor of indigenous fish belong to Devario genus, with great export and economic potential was evaluated from three different river systems of South Kerala, viz, Neyyar, Vamanapuram and Karamana river system. Since the taxonomy and nomenclature of many Cyprinids are being modified, morphometric evaluation of any Cyprinid is significant to reduce the ambiguity in taxonomy and systematics especially to delineate and document the population or habitat/environmental differences within species. A total of 19 morphometric parameters including length and weight of D. species was recorded from three river systems and compared statistically. Principal Component Analysis (PCA) was employed to delineate the habitat difference in the same species and elucidated head length as first principal component followed by snout length and pre orbital length were identified as second principal component and body depth as third principal component to distinguish three populations of the same species. Again morphometric comparison using ANOVA revealed that snout length, eye diameter and pre orbital length and pectoral fin length differed significantly between habitats within same species. Length weight relationship showed a negative allometric growth between rivers and condition factor showed fishes were in good condition with Fulton condition factor above unity.

Get The Original Articles in Source: Morphometric evaluation of an indigenous fish belong to genus Devario from three river systems of South Kerala

Journal Name: Journal of Biodiversity and Environmental Sciences (JBES)

Published By: International Network for Natural Sciences

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Flatness of the infratentorial space associated with hemifacial spasm Acta Neurochir (2016) 158:1405–1412 Whether a difference in morphology of the infratentorial space is associated with hemifacial spasm is not well understood.