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Objective: Understanding intraspecific phenotypic plasticity is a prerequisite to fish stock identifi¬cation and sustainable fisheries management. In this study, we assessed intraspecific phenotypic plasticity in terms of meristic and morphometric characters of wild populations of elongate glassy perchlet, Chanda nama from two different rivers, namely Madhumati River Narail (MRN) and Tulshiganga River Jaypurhat (TRJ), and an ox-bow lake, Jhapa Baor Jashore (JBJ) in Bangladesh. Materials and Methods: In this study, six meristics, 15 conventional morphometrics, and 23-truss-based morphometrics were subjected to a one-way analysis of variance (ANOVA), followed by the Tukey-HSD test. The mean values of three meristic counts and nine conventional and 12 truss-based morphometrics demonstrated significant differences in the ANOVA test. Furthermore, principal component analysis (PCA) and discrimination function analysis (DFA) were performed separately using conventional and truss-based morphometric data. Results: In PCA analysis, four principal components were extracted and cumulatively demon¬strated 51.848%. On the contrary, two discriminant functions (DF1, 63.5%; DF2, 36.5%) resulted from DFA analysis. In the bi-plot alignment from the discriminant space, all individuals were exceedingly separated among the three inhabitants. A dendrogram developed using conventional and truss morphometric characters confirmed that two clusters were formed among three pop¬ulations. The TRJ population formed a distinct cluster, and the JBJ population formed a different cluster with a subcluster of MRN. In the discriminant function analysis, precise classification out¬comes displayed 82% of individuals into their unique populations, whereas 66.9% of individuals were categorized as a cross-validated assemblage. Conclusion: The baseline information resulting from the current study would be useful for envi¬ronmental studies and further conservation of glassy perchlet populations in Bangladesh. [J Adv Vet Anim Res 2020; 7(4.000): 585-596]

Morphometric and meristic analysis of ladyfish, Elops machnata, were used to discriminate stocks along the Southeast and Southwest coast estuaries of India. Morphometric and meristic analyses showed a similar pattern of differentiation between E. machnata stocks and revealed a clear discreteness of two groups, an East coast (Marakanam, Parangipettai and Muthupettai) population and a West coast (Cochin) population. Higher total length (TL) (28.00 ± 7.043 cm), fork length (FL) (89.27 ± 2.201% TL) and standard length (SL) (81.77 ± 2.582% TL) were recorded in Cochin population and they were significantly different from the other three populations. Meristic counts were relatively homogenous in all the studied populations. No significant variation was found in counts of dorsal fin ray (DFR), anal fin ray (AFR), pectoral fin ray (PFR) and pelvic fin ray (PLFR). The first and second components (PCA analysis) accounted for about 92.2% of variation in all the morphometric characters. Among them, pre pectoral length (PPL) and pre dorsal length (PDL) showed high loading values in PC1 in all four populations. The overall random assignment of individuals to their original group was higher in morphometric than in meristic analysis. Such a presumption could be authenticated henceforth with molecular markers. Hence, further studies, using molecular markers are still required to precisely evaluate the genetic structure of E. machnata along the Indian coast.

Hydraulic construction on the Dnipro River led to dramatic changes in the ichthyocenosis of the estuarine waters. As a result of the regulation of the natural flow, the dynamic balance between the abiotic and biotic parameters of the habitat of aquatic organisms throughout the Dnipro-Buh river mouth system was disturbed.Transformational processes that have lasted to the present time are accompanied by changes in the main structural characteristics of ichthyocenosis, where one of the most valuable representatives of commercial cyprinids has always been the bream – Abramis brama Linnaeus, 1758.Purpose. To conduct a morphometric analysis of bream of the Dnipro-Buh river mouth system in modern conditions. To compare the results with scientific data for previous periods of succession of the ecosystem of the Dnipro-Buh river mouth system. To explain the causes of morphological variability of bream over time and analyze sexual dimorphism in the herd.Materials and methods. The research work is carried out in accordance with generally accepted methods of ichthyological research. Morphological variability is determined by Student's t-test (td). Bream individuals from age groups of five-year-old and six-year-olds are used for analysis, which makes it possible to compare the obtained data with the results of previous studies.Results. The study of the meristic signs of bream shows that at present the formulas of the fins are as follows: D - III 9 (10); A - III 24-26 (27); P - I 16-18; V - II 7-8; C I 19 I, and in the sideline there are from 53 to 56 scales. The results are within the limits of similar scientific data of the last century.It is established that the most significant changes in the proportions of the body in bream during the transformation of the drain of the Dnipro occur in height and length of the dorsal fin (td=7.5-8.7; р, Гидростроительство на реке Днепр привело к кардинальным изменениям ихтиоценоза приустьевых акваторий. В результате зарегулирования естественного стока было нарушено динамическое равновесие между абиотическими и биотическими параметрами среды обитания гидробионтов всей Днепровско-Бугской устьевой системы.Трансформационные процессы, которые длятся до настоящего времени, сопровождаются изменениями основных структурных характеристик ихтиоценоза, где одним из наиболее ценных представителей промысловых карповых всегда был лещ - Abramis brama Linnаeus, 1758.Цель. Провести морфометрический анализ леща Днепровско-Бугской устьевой системы в современных условиях. Сравнить полученные результаты с научными данными за предыдущие периоды сукцессии екосистемы Днепровско-Бугской устьевой системы. Объяснить причины морфологической изменчивости леща во времени и проанализировать половой диморфизм в стаде.Материалы и методы. Научно-исследовательские работы выполнены в соответствии с общепризнанными в практике ихтиологических исследований методик. Морфологическая изменчивость определена по t-критерию Стьюдента (td). Для анализа использовались особи леща из возрастных групп пятигодовиков-шестилеток, что позволило сравнить полученные данные с результатами предыдущих исследований.Результаты. Исследование меристических признаков леща показали, что в настоящее время формулы плавников являются следующими: D - III 9 (10); A - III 24-26 (27); P - I 16-18; V - II 7-8; C I 19 I, а в боковой линии насчитывается от 53 до 56 чешуек. Полученные результаты укладываются в пределы аналогичных научных данных прошлого столетия.Установлено, что наиболее существенными изменения пропорций тела у леща в процессе трансформации стока Днепра происходят по высоте и длине спинного плавника (td=7,5-8,7; р, Гідробудівництво на річці Дніпро призвело до кардинальних змін іхтіоценозу пригирлових акваторій. В результаті зарегулювання природного стоку була порушена динамічна рівновага між абіотичними та біотичними параметрами середовища існування гідробіонтів всієї Дніпровсько-Бузької гирлової системи.Трансформаційні процеси, які тривають до сьогодення, супроводжуються змінами основних структурних характеристик іхтіоценозу, де одним із найбільш цінних представників промислових коропових завжди був лящ - Abramis brama Linnаeus, 1758.Мета. Провести морфометричний аналіз ляща Дніпровсько-Бузької гирлової системи в сучасних умовах. Порівняти отримані результати з науковими даними за попередні періоди сукцесії екосистеми Дніпровсько-Бузької гирлової системи. Пояснити причини морфологічної мінливості ляща у часі та проаналізувати статевий диморфізм у стаді. п м т.Матеріали та методи. Науково-дослідні роботи виконані у відповідності до загальновизнаних в практиці іхтіологічних досліджень методик. Морфологічна мінливість визначена за t-критерієм Стьюдента (td). Для аналізу використані особини ляща з вікових груп п’ятрічок-шістиліток, що дозволило порівняти отримані дані з результатами попередніх досліджень.Результати. Дослідження меристичних ознак ляща показали, що на теперішній час формули плавців є наступними: D - III 9 (10); A - III 24-26 (27); P - I 16-18; V - II 7-8; C I 19 I, а у бічній лінії нараховується від 53 до 56 лусочок. Отримані результати укладаються в межі аналогічних наукових даних минулого століття.Встановлено, що найбільш суттєвими зміни пропорцій тіла у ляща в процесі трансформації стоку Дніпра відбуваються за висотою та довжиною спинного плавця (td=7,5-8,7; р

In order to clarify the distribution pattern of Cobitis populations along the southern Caspian Sea basin, 97 specimens collected from five localities were morphologically examined. Univariate analysis of variance showed significant differences (P, Kako bi se razjasnila raspodjela populacije vrste Cobitis u južnom dijelu Kaspijskog jezera, morfološki je ispitano 97 jedinki te vrste, prikupljenih s pet različitih lokaliteta. Jednosmjerna analiza odstupanja pokazala je značajne razlike (P

Atherinopsidae are widespread freshwater and shallow marine fish with singular economic importance. Morphological, genetical and life cycles differences between marine and estuarine populations were already reported in this family, suggesting ongoing speciation. Also, coexistence and interbreeding between closely related species were documented. The aim of this study was to infer boundaries among: (A) Odontesthes bonariensis and O. argentinensis at species level, and intermediate morphs; (B) the population of O. argentinensis of Mar Chiquita Lagoon and its marine conspecifics. To achieve this, we integrated, meristic, Geometrics Morphometrics and DNA Barcode approaches. Four groups were discriminated and subsequently characterized according to their morphological traits, shape and meristic characters. No shared haplotypes between O. bonariensis and O. argentinensis were found. Significative-meristic and body shape differences between the Mar Chiquita and marine individuals of O. argentinensis were found, suggesting they behave as well differentiated populations, or even incipient ecological species. The fact that the Odontesthes morphotypes shared haplotypes with both, O. argentinensis and O. bonariensis, but also possess meristic and morphometric distinctive traits open new questions related to the origin of this morphogroup. Fil: González Castro, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Rosso, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Mabragaña, Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Díaz de Astarloa, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina

Roesma DI, Santoso P. 2011. Morphological divergences among three sympatric populations of Silver Sharkminnow (Cyprinidae:Osteochilus hasseltii C.V.) in West Sumatra. Biodiversitas 12: 141-145. Silver sharkminnow (Osteochilus hasseltii C.V.) named by local people as Asang is one of potential Cyprinid fishes species found in several different ecosystems in West Sumatra. The differences of habitat types and another ecological factor among populations may have significant influences on variation and differentiation of morphological characters of this species. In order to elucidate the pattern of morphological divergence, meristic and morphometric characters of O. hasseltii in Singkarak and Dibawah Lake and adjoining river were compared. Phenogram based on cluster analysis showed specific morphological divergence among populations. There were 23 characters significantly different among all comparedpopulations, the highest degree of differentiation was found between Singkarak and Dibawah Lake population (22 characterssignificantly different) and the most similar population were Singkarak Lake and Ombilin an outlet river of lake (only six characters significantly different).Key words: fish, Osteochilus hasselti, meristic, morphometric.

Morphology character is the result of interaction between genetic and environmental factor, and the last factor is the dominant factor of variation. Morphometric character of shrimp is required to determine the value of portion of body part that can be consumed, so that it can be used as baseline in designing breeding program. This research aimed to study the variation of morphometric and meristic of Macrobrachium lar population from several rivers i.e. Andai, Wariori, Muara Prafi and Pami, in Manokwari West Papua Province. We found eight morphometric characters which were significanly different (p0.05). Morphometric characters of Andai and Pami population tended to similar each other as well as those of Wariori and Muara Prafi population. It showed that the similarity of the characters might related to close distance of the rivers. Although the four those rivers came from different upstream source, the closer distance of the M. lar population, the closer genetic relationship of M. lar population.

Persilangan antara dua populasi yang berbeda secara genetik lazimnya menghasilkan kombinasi genetik baru. Penelitian ini dilakukan untuk mengevaluasi karakteristik fenotipe dan genotipe ikan gurami strain Galunggung Hitam, Galunggung Putih, dan Hibridanya. Perkawinan dalam galur (GP X GP dan GH X GH) dan persilangan dua arah antara betina GH dan jantan GP (GH X GP), dan resiprokalnya (GP X GH) telah dilakukan di BPBIGN Singaparna. Fenotipe dianalisis berdasarkan metode truss morfometrik dan meristik, sedangkan karakteristik genotipe diamati menggunakan metode PCR-RAPD. Hasil analisis menunjukkan berdasarkan 21 karakter truss morfometrik, centroid hibrida GH X GP lebih tinggi dari centroid ketiga populasi lainnya pada PC-1 yang dicirikan oleh karakter B3, B4, B5, A3, A4, dan A6, dan bersifat intermediate pada PC-2, PC-3, dan PC-4. Berdasarkan delapan karakter meristik, centroid hibrida GH X GP lebih tinggi dari kedua tetua dan hibrida GP X GH pada PC-1 yang dicirikan oleh karakter SPR dan SDA, lebih rendah dari kedua tetua, tetapi lebih tinggi dari populasi GP X GH pada PC-2, dan lebih rendah dari ketiga populasi lainnya pada PC-3 dan PC-4. Polimorfisme dan heterozigositas pada populasi hibrida GH X GP dan GP X GH lebih tinggi daripada kedua tetuanya GH X GH dan GP X GP. Hibridisasi yang dilakukan meningkatkan variasi genetik yang dapat berguna dalam peningkatan produktivitas budidaya.Hybridization between two genetically different populations is expected to generate a population carrying new genetic combinations which may be expressed in both phenotypes and genotypes. This study was carried out to explore the phenotype and genotype characteristics of reciprocal hybrids of goramy of Galunggung black (GH) and Galunggung white (GP) with respect to their parental lines. Matings within the same line producing GP X GP and GH X GH, and reciprocal mating producing hybrids GH X GP and GP X GH, were conducted at BPBIGN Singaparna. Samples representing the four populations were analyzed for their morphology using truss morphometric and meristic methods, while genotypes were analyzed using PCR-RAPD method. The results showed that based on the 21 morphometric characters, the centroid of hybrid GH X GP was higher than those of the other three populations at PC-1, which was marked by the characters B3, B4, B5,A3, A4, and A6, and was intermediate at PC-2, PC-3, and PC-4. Based on the eight meristic characters, the centroid of GH X GP was also higher than those of their parents and hybrids GP X GH at PC-1, which was marked by the characters SPR and SDA, lower than those of their parents but higher than that of hybrid GP X GH at PC-2, and lower than those of the other three populations at PC-3 and PC-4. The genetic diversities in terms of polymorphism and heterozygosity levels in hybrids GH X GP and GP X GH were higher than those found in the pure-line (GH X GH and GP X GP). Hybridization conducted in this study had resulted in the enhancement of genetic variations which could be useful in increasing aquaculture productivity.

Echinorhynchus truttae and the Echinorhynchus bothniensis species complex are common parasites of salmoniform and other fishes in northern Europe. Echinorhynchus bothniensis and its sibling species Echinorhynchus 'bothniensis' are thought to be closely related to the Nearctic Echinorhynchus leidyi Van Cleave, 1924 based on morphological similarity and common usage of a mysid intermediate host. This study provides the first analysis of morphological and meristic variation in Echinorhynchus truttae and expands our knowledge of anatomical variability in the Echinorhynchus bothniensis group. Morphological variability in Echinorhynchus truttae was found to be far greater than previously reported, with part of the variance attributable to sexual dimorphism. Echinorhynchus truttae, the two species of the Echinorhynchus bothniensis group and Echinorhynchus leidyi displayed considerable interspecific overlap in the ranges of all conventional morphological characters. However, Proboscis profiler, a tool for detecting acanthocephalan morphotypes using multivariate analysis of hook morphometrics, successfully separated Echinorhynchus truttae from the other taxa. The Echinorhynchus bothniensis species group could not be reliably distinguished from Echinorhynchus leidyi (or each other), providing further evidence of the affinity of these taxa. Observations on the distribution of Echinorhynchus truttae in its definitive host population are also reported.

The two groups of grass carp, have been propagated in North and South fish farms and then the larvae were transferring to Abziroshd and culture fish farm of Mazandaran. The fingerling at eight weight classes of 2 to 500 gram were investigated morphologically and some morphometric and meristic were compared. The South grass carp was significant difference (P

Report of the project entitled "determination of the global population structure of the great sturgeon (Huso huso) with emphasis on the Golestan Province" is in front of your attention. Outcome is the results of study on the samples collected from the total catch in the landing sites namely Bandar-e-Anzali, Babolsar, and Ashooradeh, in the three Northern provinces. 224 specimens were collected according to the sampling manual during the fishing seasons in 2005 and 2006. Three methods were applied in this study to find out the population structure of the great sturgeon in the southern Caspian Sea. These were as follows: Morpho-metric meristic Population dynamics Population genetics (microsatellite loci) Results indicate that the range of different age groups of the great sturgeon in the Golestan Province is larger than the other two provinces. Results show that the older age groups are found in the samples from the Golestan Province rather than the other two provinces. Results demonstrate that the sample size for the two methods (morpho-metric meristic and population dynamics) is not enough. In order to obtain precise results with less uncertainty one needs to collect more specimens. Therefore, according to the few number of the great sturgeon in the total sturgeon landing, it is recommended that researchers apply methods other than the two methods which are mentioned above in order to make sure that the results are most reliable. Population genetics methods including microsatellite loci are among the methods which could produce good results with minimum bias in this regard. Results indicate that there are two distinguishable populations of the great sturgeon (Huso huso) in the southern part of the Caspian Sea off the shores of the three Northern provinces. Results also show that these two populations are scattered in the two east end (Golestan Province) and west end (Guilan Province) of the southern Caspian Sea. The two populations have overlapped each other in the Mazandaran Province. Iranian Fisheries Science Research Institute Published

The occurrence, meristic, length frequency, condition factor, length–weight relationship and day/night differences in catch are reported for a population of cuskeel Ophidionrochei at Duće-Glava (43°26′N 16°41′E, Croatian coast, eastern middle Adriatic) from April 2000 to March 2001. The highest catches in shallow water occurred in June, with a second peak in September and October, and were always at night, indicating this species as nocturnal predator.