scholarly journals Taxonomy of Piscian Cestodes of Freshwater fish: A cladistic model of Morphotaxonomic Study of Rare Tapeworm from the Dehradun Region (U.K.), India

2020 ◽  
Vol 2 (12) ◽  
pp. 7-13
Keyword(s):  
Experimental Study ◽  
Experimental Design ◽  
Freshwater Fish ◽  
Vitelline Follicle ◽  
Morphological Study ◽  
Freshwater Fishes ◽  
Morphological Characters ◽  
Ganga River ◽  
Freshwater Catfish ◽  
Host Fishes

The current experimental study has been conducted to analyze cladistic taxonomic aspects of the piscian cestode parasites including its morphological characters. Freshwater fishes caught on the spot at selected sampling stations with the help of local fishermen and collected for tapeworm investigations. Freshwater catfish Clarias batrachus (Linnaeus, 1758)[3] collected from Dehradun sampling stations and examined for tapeworm parasites as per experimental design. The collected fishes were brought to the Parasitology laboratory for experimental study and morphological as well as anatomical facts investigation. Parasites obtained from infected host fishes kept intact in 5% formalin for further investigation. Ten cestode (tapeworm) parasites were found from its infested Intestine. The morphological study of tapeworms indicates that parasitic diversity is accessible within the Ganga river at Dehradun (U.K.) region. Morphotaxonomic characterization reported as - H, butterfly flap shaped ovary, testes numerous and well developed, vitelline follicle - cortical and medullary. This study provides an overview of the piscian tapeworm parasites of some freshwater fishes inhabiting the Ganga river

scholarly journals Morphotaxonomic Cladistic Analysis of Rare Cestode Parasites from the Prayagraj Region (U.P.), India

2020 ◽  
Vol 2 (10) ◽  
pp. 16-19
Author(s):  
Amar Jeet Singh ◽  
◽  
Aditya Narayan ◽  
Sarvjeet Singh ◽  
◽  
...  
Keyword(s):  
Vitelline Follicle ◽  
Morphological Study ◽  
Cladistic Analysis ◽  
Morphological Characters ◽  
Ganga River ◽  
Clarias Batrachus ◽  
Freshwater Catfish

The present study has been conducted to investigate taxonomic aspects of the piscian cestode focusing on its morphological characters. freshwater catfish Clarias batrachus (Linnaeus, 1758) were collected from sampling stations and examined for tapeworm parasites. Six tapeworm parasites were found from its Intestine. The morphological study of cestode indicates that parasitic diversity is available in the Ganga river at Prayagraj (U.P.) region. Morphotaxonomic characters were examined as – H, butterfly-shaped ovary, vitelline follicle - cortical.

DESCRIPTION OF FOUR NEW SPECIES OF SENGA (PLATYHELMINTHES: CESTOIDEA) FROM FRESHWATER FISHES OF INDIA

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
SURANJANA BANERJEE ◽  
BUDDHADEB MANNA ◽  
A. K. SANYAL
Keyword(s):  
New Species ◽  
Freshwater Fish ◽  
West Bengal ◽  
Freshwater Fishes ◽  
Morphological Characters ◽  
Channa Punctatus ◽  
Valid Species ◽  
Short Neck ◽  
Apical Disc ◽  
Mastacembelus Armatus

The genus Senga6 contains 47 valid species. Four new species of Senga6, reported from India.Senga kakdwipensis sp.nov. collected from the intestine of a freshwater fish, Mastacembelus armatus from Kakdwip, South 24-Parganas, West Bengal; Senga bengalensis sp.nov. collected from the freshwater fish, Mastacembelus armatus from Hasnabad, North 24-Parganas, West Bengal; Senga orissaensis sp.nov. collected from the intestine of a freshwater fish, Channa punctatus from Puri district of Orissa and Senga nagalandensis sp.nov. collected from the intestine of a freshwater fish Colisa fasciata from Mokokchung district of Nagaland. Senga kakdwipensis sp.nov. characterized by a triangular scolex, 0.115-0.56 in length and 0.275-0.08 in breadth ; absence of neck; rostellar hooks arranged in a single circle, 46-56 in number and testes 45-48 in number. Senga bengalensis sp.nov. characterized by a triangular scolex, 0.23-0.445 in length and 0.085-0.27 in breadth; a pair of fleshy bothria present; rostellar hooks 48-50 in number of two different sizes arranged in two semicircles; presence of neck; testes 50-60 in number.Senga orissaensis sp.nov. characterized by a pear-shaped scolex that measures 0.1 in length and 0.2 in breadth; rostellar hooks 54 in number arranged in two semicircles; presence of short apical disc; short neck present; testes 39-40 in number. Senga nagalandensis sp.nov. characterized by an ovoid scolex with a pair of fleshy half-moon-shaped bothria, measures 0.45 x 0.35; apical disc present and is provided with 46 unequal rostellar hooks arranged in a single circle; neck absent; testes are 60-70 in number. The presence of these new morphological characters differentiates the three observed new species from the rest of the described species in the genus.

Enhancing statistical literacy skills through real life activities enriched with gamification elements: An experimental study

2021 ◽  
pp. 204275302098701
Author(s):  
Ünal Çakıroğlu ◽  
Mustafa Güler
Keyword(s):  
Experimental Study ◽  
Experimental Design ◽  
Positive Impact ◽  
Real Life ◽  
Literacy Skills ◽  
Statistical Literacy ◽  
Instructional Process ◽  
Post Test ◽  
Quasi Experimental ◽  
Teaching Statistics

This study attempts to determine whether gamification can be used as a pedagogical technique to overcome the challenges in teaching statistics. A post-test quasi-experimental design was carried out in gamified and non-gamified groups in order to reveal the effect of gamification elements in cultivating students’ statistical literacy skills. Students in gamified group were also interviewed to understand the function of gamification process. The results suggest that; although gamifying the instructional process had a positive impact on developing students’ statistical literacy in medium and high score students; surprisingly the influence of the gamification to the low- achieved scores were not positive. The positive impact was discussed in accordance with the gradual structure of statistical literacy and suggestions for successful gamification applications due to the context were included.

scholarly journals Probiotics for cultured freshwater fish

2020 ◽  
Vol 41 (2) ◽  
pp. 105
Author(s):  
Javier Fernando Melo-Bolívar ◽  
Ruth Yolanda Ruiz-Pardo ◽  
Michael E Hume ◽  
Hanna E Sidjabat ◽  
Luisa Marcela Villamil-Diaz
Keyword(s):  
Water Quality ◽  
Gastrointestinal Tract ◽  
Stress Tolerance ◽  
Freshwater Fish ◽  
Filamentous Fungi ◽  
Growth Promotion ◽  
Freshwater Fishes ◽  
Fish Feed ◽  
Probiotic Strains ◽  
Commercial Applications

Probiotic products are viewed as an alternative to the use of antibiotics in freshwater fishes farming. Probiotic organisms include bacteria, yeast, and filamentous fungi offering different benefits to fish including growth promotion, inhibition of pathogen colonisation, and improvement of nutrient digestion, water quality, and stress tolerance, as well as enhancement of reproduction. For these reasons, this review aims to identify the main trends in probiotic amendment in freshwater fishes. Strategies to incorporate the probiotic strains in the fish feed or pellets to allow optimal viability of the strains as they reach the fish gastrointestinal tract (GIT) are crucial in probiotic research and commercial applications for freshwater fish.

scholarly journals Ecology and Conservation of Freshwater Fishes Biodiversity: We Need More Knowledge to Develop Conservation Strategies

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1929
Author(s):  
Rafael Miranda ◽  
Imanol Miqueleiz
Keyword(s):  
Freshwater Fish ◽  
Freshwater Fishes ◽  
Conservation Strategies ◽  
Vertebrate Species

Freshwater fish represent one-fourth of all vertebrate species, despite freshwater occupying less than 1% of the Earth’s surface [...]

scholarly journals Aluminium induced Intrauterine Growth Retardation - an experimental study

2016 ◽  
Vol 10 (1) ◽  
Author(s):  
Mamoona Nasim
Keyword(s):  
Heavy Metal ◽  
Experimental Study ◽  
Body Weight ◽  
Experimental Design ◽  
Growth And Development ◽  
Intrauterine Growth Retardation ◽  
Control Groups ◽  
Intrauterine Growth ◽  
Aluminum Sulphate ◽  
Pregnant Mice

Present study was carried out to determine the effect of aluminum containing antacid on the intrauterine growth and development of fetus. The duration of exposure was also correlated with the effects on fetal morphology and their weights. Seventy-two pregnant mice were given a daily i.e., dose of 0.7mg/100g of aluminum sulphate for various periods according to the grouping of experimental design. This dose was equivalent to maximum therapeutic dose of aluminum salt for a 70 kg man i.e. 5000mg aluminum/day. Fetal examination was performed on day 20 of gestation. The number of live and dead fetuses in the treated animals was not significantly different from the control groups. Therefore embryo lethality of aluminum cannot be induced. However there was a decrease in fetal body weight that was directly related to the duration of exposure to aluminum sulphate solution. Dissecting microscopic examination showed, the development was arrested in the groups exposed to drugs for longer periods. These results revealed that aluminum is a type of heavy metal, which is teratogenic for mammals even in doses, which are nontoxic for adults.

scholarly journals The Evolution of Alternative Buoyancy Mechanisms in Freshwater Fish Eggs

2021 ◽  
Vol 9 ◽  
Author(s):  
Feng Chen ◽  
Carl Smith ◽  
Yeke Wang ◽  
Jun He ◽  
Wulai Xia ◽  
...  
Keyword(s):  
Parental Care ◽  
Freshwater Fish ◽  
Relative Size ◽  
Negative Relationship ◽  
Freshwater Fishes ◽  
Perivitelline Space ◽  
Fish Eggs ◽  
Reproductive Tactics ◽  
Oil Droplets ◽  
Pelagic Eggs

Alternative reproductive tactics (ARTs) are behavioural, morphological, and physiological traits associated with alternative reproductive phenotypes within a population or species. ARTs are widespread in nature, and are a particular feature of teleost fishes. However, few studies have examined egg buoyancy mechanisms in the context of the evolution of ARTs in freshwater fishes. In marine fishes, egg buoyancy is achieved chiefly through hydration. While the buoyancy of freshwater fish eggs has been suggested to be determined primarily through the presence of oil droplets, the majority (60%) of freshwater pelagic eggs do not possess an oil droplet. We applied a physical model of buoyancy to understand the contributions of oil droplets and hydration to the buoyancy of pelagic freshwater fish eggs. We further used phylogenetic regression to estimate the effect of the relative size of the perivitelline space, habitat and parental care on the occurrence of oil droplets, while controlling for non-independence among species due to phylogenetic relatedness. Our analysis demonstrates that the probability of oil droplets in freshwater pelagic eggs exhibits a significant negative relationship with the size of perivitelline space, which may reflect a trade-off relating to energy allocation in contrasting habitats. We also demonstrate a positive association between the probability of oil droplets and the provision of parental care and occupancy of lentic habitats. These findings indicates the evolution of contrasting buoyancy mechanisms as novel ARTs in freshwater fishes. A theoretical model in combination with empirical analysis indicate the evolution of novel ARTs in freshwater fishes as adaptive responses to flow conditions.

scholarly journals A review of length-weight relationships of freshwater fishes in Malaysia

2018 ◽  
Vol 20 (1) ◽  
pp. 55-68 ◽  
Author(s):  
Amonodin Mohamad Radhi ◽  
Mohd-Fadzil Nurul Fazlinda ◽  
Mohammad Noor Azmai Amal ◽  
Hashim Rohasliney
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Environmental Changes ◽  
Meta Analysis ◽  
Freshwater Fishes ◽  
Clarias Batrachus ◽  
Ecological Health ◽  
Allometric Growth ◽  
Freshwater Fish Species

Abstract This manuscript reviews the length-weight relationships (LWRs) of freshwater fishes in Malaysia. A total of 102 LWRs of fishes gathered from literature pertaining to 64 freshwater fish species were analysed. A meta-analysis from 13 previous reports showed that the b values was ranged from 2.19 (Clarias batrachus) to 4.106 (Barbodes binotatus). Out of 64 observed species, 47 species (11 families) experienced positive allometric growth, while another 23 species (eight families) and 31 species (12 families) were recorded under isometric and negative allometric growth, respectively. The fish LWRs observed can be used as an indicator of environmental changes and fish ecological health for freshwater fishes in Malaysia.

Distribution of freshwater fish from the Southern Neotropics reveals three new areas of endemism and show diffuse limits among freshwater ecoregions

2021 ◽  
Vol 19 (4) ◽  
Author(s):  
José Bessonart ◽  
Marcelo Loureiro ◽  
José Carlos Guerrero ◽  
Claudia Szumik
Keyword(s):  
Freshwater Fish ◽  
Grid Cell ◽  
Freshwater Fishes ◽  
Neotropical Region ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Areas Of Endemism

Abstract Ecoregions and areas of endemism are central concepts in biogeography. Based on collection records and the Endemic Analyses implemented with NDM/VNDM method we analyzed fish areas of endemism in the junction of three freshwater ecoregions related to the Rio de la Plata estuary (Lower Parana, Lower Uruguay, Laguna dos Patos) in Southern Neotropical region. Using two grid cell sizes, results obtained showed the same general patterns. Areas of endemism recovered were mainly associated either to Lower Uruguay or to Laguna dos Patos. In both ecoregions nested areas of endemism were identified within larger patterns of endemism. Noteworthy, one area recovered occurred across Lower Uruguay and Laguna dos Patos limits. Our results also suggest a revision of the Lower Uruguay and Lower Parana ecoregion limits, and highlight the relevance of the Rio de la Plata estuary as a barrier and corridor for freshwater fishes in the area.

Description of two new species of Rhamphus related to R. oxyacanthae (Curculionidae, Curculioninae, Rhamphini) from Italy based on a morphological study supported by molecular data

Zootaxa ◽  
2021 ◽  
Vol 4995 (1) ◽  
pp. 111-128
Author(s):  
LUCIANO DIOTTI ◽  
ROBERTO CALDARA ◽  
IVO TOŠEVSKI
Keyword(s):  
New Species ◽  
Morphological Study ◽  
Host Plants ◽  
Molecular Study ◽  
Morphological Characters ◽  
Molecular Data ◽  
Integrative Taxonomy ◽  
The Other ◽  
Distribution Data ◽  
Two New Species

Two new species of the weevil genus Rhamphus from Italy are herein described: R. bavierai n. sp. (Sicily) and R. hampsicora n. sp. (Sardinia). Both are morphologically and from a molecular perspective close to R. oxyacanthae (Marsham, 1802) and R. monzinii Pesarini & Diotti, 2012. Aside from a diagnostic description and a synoptic key, distribution data and notes on the host plants of the four species are reported. Whereas R. monzinii can be distinguished by several morphological characters, the other three species are morphologically very similar to each other and separable only by the combination of a few subtle characters. On the contrary, a preliminary molecular study revealed substantial divergences of mtCOI from 6.2 to 14.9% between the species, confirming the importance of an integrative taxonomy.  

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