scholarly journals BIOMETRIC ANALYSIS OF THE ARTIFICIAL HYBRIDIZATION BETWEEN Pangasius djambal BLEEKER, 1846 AND Pangasianodon hypophthalmus SAUVAGE, 1878

2016 ◽  
Vol 5 (2) ◽  
pp. 70 ◽  
Author(s):  
Rudhy Gustiano
Keyword(s):  
Morphological Analysis ◽  
Wild Population ◽  
Parental Species ◽  
Morphological Characters ◽  
Morphometric Measurements ◽  
Biometric Analysis ◽  
Pangasianodon Hypophthalmus ◽  
Meristic Counts ◽  
Potential Impact ◽  
Gill Raker

It is really important, since the possible use of these pangasiid hybrids in aquaculture faces the problem of potential impact on wild population. Therefore, it is urgently needed to provide quick identification tools in the field. This study investigated morphological characters of Pangasius djambal and Pangasianodon hypophthalmus and their hybrids. A detailed morphological analysis using 32 morphometric measurements and five meristic counts was done on the hybridization of P. djambal and P. hypophthalmus. Morphometric analysis and meristic counts showed that the reciprocal hybrids have intermediate characters except for gill raker number in which lower than that of parental species. In general, the hybrids have tendency to be like P. hypophthalmus rather than P. djambal. The only typical character of P. djambal appeared on hybrids is teeth shape, both vomerine and palatine. It is clearly defined that the true hybrids have seven pelvic fin rays.

scholarly journals BIOMETRIC ANALYSIS OF THE ARTIFICIAL HYBRIDIZATION BETWEEN Pangasius djambal BLEEKER, 1846 AND Pangasianodon hypophthalmus SAUVAGE, 1878

2016 ◽  
Vol 5 (2) ◽  
pp. 70 ◽  
Author(s):  
Rudhy Gustiano
Keyword(s):  
Morphological Analysis ◽  
Wild Population ◽  
Parental Species ◽  
Morphological Characters ◽  
Morphometric Measurements ◽  
Biometric Analysis ◽  
Pangasianodon Hypophthalmus ◽  
Meristic Counts ◽  
Potential Impact ◽  
Gill Raker

It is really important, since the possible use of these pangasiid hybrids in aquaculture faces the problem of potential impact on wild population. Therefore, it is urgently needed to provide quick identification tools in the field. This study investigated morphological characters of Pangasius djambal and Pangasianodon hypophthalmus and their hybrids. A detailed morphological analysis using 32 morphometric measurements and five meristic counts was done on the hybridization of P. djambal and P. hypophthalmus. Morphometric analysis and meristic counts showed that the reciprocal hybrids have intermediate characters except for gill raker number in which lower than that of parental species. In general, the hybrids have tendency to be like P. hypophthalmus rather than P. djambal. The only typical character of P. djambal appeared on hybrids is teeth shape, both vomerine and palatine. It is clearly defined that the true hybrids have seven pelvic fin rays.

scholarly journals Evaluation of Pangasius djambal Bleeker 1846 and Pangasianodon hypophthalmus (Sauvage 1878) Hybrids: Biometric, Growth, and Ovarian Maturation

2016 ◽  
Vol 18 (1) ◽  
pp. 32
Author(s):  
Rudhy Gustiano ◽  
Anang H. Kristanto ◽  
Evi Tahapari ◽  
Bambang Iswanto
Keyword(s):  
Growth Performance ◽  
Morphological Analysis ◽  
Ovarian Development ◽  
Wild Population ◽  
Parental Species ◽  
Fish Production ◽  
Pangasianodon Hypophthalmus ◽  
Reciprocal Hybrids ◽  
Potential Impact ◽  
Aquaculture Production

<p>Evaluasi Karakter Biometrik, Pertumbuhan, dan Perkembangan Telur Hibrida Pangasius Djambal Bleeker 1846 dan Pangasianodon Hypophthalmus (Sauvage 1878). Rudhy Gustiano, Anang H. Kristanto, Evi Tahapari, dan Bambang Iswanto. Program hibridisasi telah lama digunakan untuk meningkatkan produksi perikanan, lebih dari tiga dekade. Perhatian besar terhadap program hibridisasi merupakan kekhawatiran pengaruhnya terhadap populasi alami. Oleh karena itu, diperlukan penyediaan alat untuk mengidentifikasi secara cepat dan akurat di lapang. Kajian ini bertujuan untuk meneliti karakter biometrik, keragaan pertumbuhan, dan perkembangan telur Pangasius djambal dan Pangasianodon hypophthalmus dan hibridanya. Analisis morfologi secara lengkap dilakukan pada hibrida. Uji pertumbuhan di kolam tanah dan pengamatan terhadap perkembangan telur juga diamati. Hasil pengamatan morfometrik dan meristik memperlihatkan bahwa hibrida memiliki karakter antara kedua induk asli, kecuali jumlah gigi tapis insang yang lebih sedikit dibandingkan dengan tetuanya. Pengujian pertumbuhan di kolam tanah memperlihatkan hibrida memiliki pertumbuhan yang lebih cepat dibandingkan dengan tetuanya, sedangkan perkembangan telur hibrida menunjukkan abnormal. Perkembangan telur tidak pernah mencapai kematangan sempurna, sebagian besar rusak dan berlemak. Dari kajian yang dilakukan, dapat dikemukakan bahwa hibrida P. djambal and P. hypophthalmus adalah hibrida yang sesungguhnya. Hibrida ini dapat digunakan sebagai benih sebar untuk kegiatan produksi budi daya karena dapat dideteksi dengan mudah dari kedua tetuanya, lebih cepat tumbuh, dan tidak dapat berkembang biak.</p><p> </p><p><strong>Abstrak</strong></p><p>Hybridization program has been used to increase fish production for more than three decades. Concern to this program is due to the problem of potential impact on wild population. Hence, it is urgently needed to provide quick identification tools in the field and as well as commercial aspect in term of growth rate. This study investigated biometric characters, growth performance, and ovarian development of Pangasius djambal and Pangasianodon hypophthalmus and their reciprocal hybrids. A detailed morphological analysis was done on the hybrids of P. djambal and P. hypophthalmus. Earthen pond on the growth comparison as well as the ovarian development was also observed. The results of morphometric and meristic showed that the reciprocal hybrids have intermediate characters except for gill rakers numbers in which lower than that of parental species. Growth analysis showed that hybrids has better performance compare to the parental one, while ovarian development of hybrids was developed abnormal. No oocytes reached vitellogenesis and showed major atresia and fatty. It can be concluded that hybrids of P. djambal and P. hypophthalmus is true hybrids. The hybrids can be used as final seed for aquaculture production due to clearly identify from parents, superior growth performance and steril.</p>

scholarly journals EVALUATION OF HYBRIDIZATION BETWEEN PANGASIUS DJAMBAL BLEEKER 1846 AND PANGASIANODON HYPOPHTHALMUS (SAUVAGE 1878): BIOMETRIC CHARACTERIZATION AND GROWTH ANALYSIS

2007 ◽  
Vol 2 (1) ◽  
pp. 27
Author(s):  
Rudhy Gustiano ◽  
Anang Hari Kristanto
Keyword(s):  
Growth Rate ◽  
Specific Growth ◽  
Parental Species ◽  
Morphological Characters ◽  
Rapid Identification ◽  
Morphometric Measurements ◽  
Pangasianodon Hypophthalmus ◽  
Reciprocal Hybrids ◽  
Parental Stock ◽  
Meristic Counts

Possible use of pangasiid hybrids in aquaculture might generate potential impacts on wild populations. Therefore, rapid identification tools in the field such as growth rate are urgently needed. This study examines morphological characters and growth performance of P. djambal and P. hypophthalmus and their reciprocal hybrids. A detailed morphological study analysed 32 morphometric measurements and 5 meristic counts on hybrids of Pangasius djambal and P. hypophthalmus. Morphometric analysis and meristic counts showed that the reciprocal hybrids have intermediate characters except for gill rakers number which were lower than that of parental species. In general, the hybrids have tendency to be like P. hypophthalmus rather than P. djambal. The only typical character P. djambal appearing in hybrids is teeth shape, both vomerine and palatine. It was shown that the true hybrids have seven pelvic fin rays. Eight months of growth comparison in earthen ponds showed that the hybrids have a better performance for specific growth rate than the parental stock.

Phenotypic Variation in the Lake Whitefish, Coregonus clupeaformis, Induced by Introduction into a New Environment

1974 ◽  
Vol 31 (1) ◽  
pp. 55-62 ◽  
Author(s):  
J. S. Loch
Keyword(s):  
Feeding Habits ◽  
Morphological Characters ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Meristic Characters ◽  
Line Scale ◽  
Benthic Food ◽  
Glycerol 3 Phosphate Dehydrogenase ◽  
Gill Raker ◽  
Electrophoretic Phenotype

Adult lake whitefish (Coregonus clupeaformis) from Clearwater Lake and second generation adults of offspring from Clearwater whitefish transplanted to Lyons Lake were compared with respect to morphometric and meristic characters and isozymes of L-glycerol-3-phosphate dehydrogenase (GPDH). Feeding habits and abundance of pelagic and benthic foods were compared in the two lakes.Gill raker number, lateral line scale count, and interorbital width remained constant between parental and offspring populations. Gill raker length was the main character found to differ between the populations. This was found to be related to the percentage and type of benthic food eaten. Abrasion of the gill rakers is offered as an explanation for the differences in gill raker length. Differences were found in various other meristic and morphological characters, as well as in electrophoretic phenotype frequencies of isozymes of GPDH.

Combined molecular and morphological phylogeny of Ephemerellinae (Ephemerellidae: Ephemeroptera), with remarks about classification

Zootaxa ◽  
2009 ◽  
Vol 1991 (1) ◽  
pp. 28-42 ◽  
Author(s):  
T. HEATH OGDEN ◽  
JONATHAN T. OSBORNE ◽  
LUKE M. JACOBUS ◽  
MICHAEL F. WHITING
Keyword(s):  
Morphological Analysis ◽  
Sequence Data ◽  
Histone H3 ◽  
Morphological Characters ◽  
Morphological Data ◽  
Rdna Genes ◽  
Dna Sequence Data ◽  
Extant Genus ◽  
Species Groups ◽  
Combined Data

This study represents the first combined molecular and morphological analysis for the mayfly family Ephemerellidae (Ephemeroptera), with a focus on the relationships of genera and species groups of the subfamily Ephemerellinae. The phylogeny was constructed based on DNA sequence data from 3 nuclear (18S rDNA, 28S rDNA, histone H3) and 2 mitochondrial (12S rDNA, 16S rDNA) genes, and 23 morphological characters. Taxon sampling for Ephemerellidae included exemplars from all 25 extant genus groups and additional representatives from those genera with the highest diversity. Ephemerellidae appears to consist of three major clades. Ephemerella, the largest genus of Ephemerellidae, and Serratella were not supported as monophyletic, and each had representatives in two of the three major clades. However, the genera Drunella and Cincticostella were supported as monophyletic. Lineages strongly supported as monophyletic include a grouping of the Timpanoginae genera Timpanoga, Dannella, Dentatella and Eurylophella, and groupings of the Ephemerellinae genera Torleya, Hyrtanella and Crinitella and the genera Kangella, Uracanthella and Teloganopsis. The placement of the Timpanoginae genus Attenella fell within Ephemerellinae, based on molecular and combined data, but it grouped with other Timpanoginae based on morphological data alone. Further study and analysis of Ephemerellidae morphology is needed, and classification should be revised, if it is to reflect phylogenetic relationships.

scholarly journals First records of Madeira rockfish Scorpaena maderensis (Osteichthyes: Scorpaenidae) from the Tunisian coast (central Mediterranean)

2018 ◽  
Vol 59 (2) ◽  
pp. 231-236
Author(s):  
Sihem Rafrafi-Nouira ◽  
Daniel Golani ◽  
Chrisitan Capapé
Keyword(s):  
Central Mediterranean ◽  
Morphometric Measurements ◽  
Tunisian Coast ◽  
Meristic Counts ◽  
New Findings ◽  
Viable Population ◽  
Living Area

The authors present the first records of Madeira rockfish Scorpaena maderensis Valenciennes,1833 from the Tunisian coast (central Mediterranean). The specimens are described including morphometric measurements and meristic counts. The origin of the species in its new living area is discussed and commented. However, these new findings confirm the establishment of a viable population of S. maderensis in central Mediterranean.

Morphological variation in the genus Juliomys (Rodentia: Cricetidae: Sigmodontinae) and taxonomic status of Juliomys anoblepas (Winge 1887) from the Quaternary of Southeast Brazil

Zootaxa ◽  
2020 ◽  
Vol 4861 (3) ◽  
pp. 429-443
Author(s):  
CAROLINA PIRES ◽  
MARCELO WEKSLER ◽  
CIBELE R. BONVICINO
Keyword(s):  
Principal Component Analysis ◽  
Morphological Variation ◽  
Morphological Analysis ◽  
Principal Component ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
The Other ◽  
Anterior Portion ◽  
Living Species ◽  
Qualitative Characters

The region of Lagoa Santa, Minas Gerais, Brazil, is one of the most important karstic areas of the Brazilian Quaternary due to the faunistic diversity of living and extinct forms. Among them, some taxa remain poorly studied, as is the case of Calomys anoblepas Winge 1887. Despite the recent allocation of the taxon within Juliomys, its description and morphological analysis are condensed, based on comparative few specimens and on few informative characters. In this study, we investigate characters proposed to distinguish species of Juliomys, and reevaluate the taxonomic status of the fossil Juliomys anoblepas. We analyzed 80 cranio-dental morphological characters in 233 specimens represented by the four species currently recognized: J. pictipes (Osgood 1933), J. rimofrons Oliveira & Bonvicino 2002, J. ossitenuis Costa, Pavan, Leite & Fagundes 2007, and J. ximenezi Christoff, Vieira, Oliveira, Gonçalves, Valiati & Tomasi 2016. We also performed principal component analysis on eight craniodental measurements available for the J. anoblepas hypodigm. The review of morphological systems and the evaluation of the characters used in the literature revealed that there are no diagnostic characters in the anterior portion of the skull and in the molar series of Juliomys, being difficult to differentiate the fossil from the other living species. Only six qualitative characters were variable and applicable to the hypodigm of J. anoblepas. Characters are polymorphic, invariable, or the fossil is not sufficiently complete to determinate its states. The taxon could not be morphometrically differentiated from J. pictipes and J. ossitenuis. Based on the results presented herein, we consider J. anoblepas as a nomen dubium and restrict its name to the taxon’s hypodigm. 

Subpopulation Status of Lake Whitefish (Coregonus clupeaformis) in Lake Winnipeg

1990 ◽  
Vol 47 (8) ◽  
pp. 1484-1494 ◽  
Author(s):  
A. H. Kristofferson ◽  
J. W. Clayton
Keyword(s):  
Lactate Dehydrogenase ◽  
Coregonus Clupeaformis ◽  
Genetic Contribution ◽  
Lake Whitefish ◽  
Morphometric Measurements ◽  
Lake Winnipeg ◽  
Meristic Counts ◽  
Grand Rapids ◽  
Parent Stock ◽  
Glycerol 3 Phosphate Dehydrogenase

Spawning lake whitefish in Lake Winnipeg from Dauphin River–Lake St. Martin, Traverse Bay, Berens River–Poplar River–Big Black River and Grand Rapids and in Little Playgreen Lake are accorded subpopulation status based on morphometric measurements, meristic counts, and differences in frequencies of alleles at the muscle glycerol-3-phosphate dehydrogenase (g-3-pdh-b) locus. The frequency of the g-3-pdh-b-3 allele in samples from Dauphin River–Lake St. Martin was 0.77 compared with 0.46 for whitefish from the remainder of Lake Winnipeg and Little Playgreen Lake. Two loci for isocitrate dehydrogenase and one lactate dehydrogenase locus are also polymorphic in these fish but no significant allele frequency differences were found at these loci among the samples of spawners compared above. Hatchery-reared lake whitefish, obtained from stock in Clearwater Lake and William Lake and planted as fry or eyed eggs in Lake Winnipeg at Dauphin River and Grand Rapids, do not appear to have made a detectable genetic contribution to the local whitefish stocks, based on differences in g-3-pdh-b and idh Bβ allele frequencies among parent stock and spawners captured near the release sites.

A new genus Turneroconcha (Bivalvia: Vesicomyidae: Pliocardiinae) for the giant hydrothermal vent clam ‘Calyptogena’ magnifica

Zootaxa ◽  
2020 ◽  
Vol 4808 (1) ◽  
pp. 79-100 ◽  
Author(s):  
ELENA M. KRYLOVA ◽  
HEIKO SAHLING
Keyword(s):  
Morphological Analysis ◽  
New Genus ◽  
Posterior Part ◽  
Morphological Characters ◽  
Morphological Data ◽  
Monotypic Genus ◽  
East Pacific ◽  
Inhalant Siphon ◽  
The Right ◽  
Galapagos Rift

A new monotypic genus, Turneroconcha, is established for T. magnifica (Boss & Turner) which was originally assigned to the genus Calyptogena Dall. The distinguishing morphological characters of the new genus are the combination of both conchological and anatomical features including: the presence of only two tooth elements in the right valve; submerged location of the posterior part of the posterior lamellar ligament layer; the absence of a subumbonal pit, lunular incision, escutcheon and pallial sinus; the presence of both pairs of demibranchs; the tubular structure of marginal parts of the interlamellar septa in gills; an inner valve of the inhalant siphon without processes; tentaculate inner mantle fold 3 and a Z-shaped digestive tract. Analysis of morphological data on Recent and fossil pliocardiines shows that Turneroconcha gen. nov. can be presently considered as a monotypic genus. The comparative morphological analysis of the new genus with described pliocardiine genera is consistent with available molecular results. Turneroconcha gen. nov. is endemic to the East-Pacific Rise and Galapagos Rift and occurs at water depths of 2251 to 2791 m. It is the only pliocardiine genus known so far with a mainly epifaunal life habit. No fossils of Turneroconcha gen. nov. are known.  

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