Russian Vietnamese Tropical Research and Technological Center

Nha Trang, Vietnam

Russian Vietnamese Tropical Research and Technological Center

Nha Trang, Vietnam
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Pavlov D.A.,Moscow State University | Emel'yanova N.G.,Moscow State University | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2011

Features of reproductive biology and the stages of early ontogeny are described in the mass tropical species manybar goatfish Parupeneus multifasciatus. In general, in the catches represented by mainly sexually mature fishes, females prevail but males prevail in the largest size classes. The females reach their first sexual maturity by approximately 110 mm fork length, and they are characterized by continuous oogenesis and egg deposition in batches. The fish spawn over the entire year with a trend to lower values of the gonadosomatic index (GSI) of the females from June to October. The features of early ontogeny are compared in manybar goatfish and red mullet Mullus barbatus ponticus from the Black Sea. © 2011 Pleiades Publishing, Ltd.


Pavlov D.A.,Moscow State University | Emel'yanova N.G.,Moscow State University | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2014

Features of reproduction are described in the tropical representative of the family Mullidae freckled goatfish Upeneus tragula from southern Central Vietnam (Nha Trang Bay) and North Vietnam (Ha Long Bay). Sex ratios of the fishes (females: males) in Nha Trang and Ha Long bays are 0.93: 1 and 1.2: 1, respectively. In both bays, the body length-body weight relationship is not substantially different between the females and males. In Nha Trang Bay, the females reach sexual maturity by 10.2 cm fork length (50% of individuals), and the fishes spawn over the entire year. In a part of the population (on average, 23.5% of fishes), the interruptions in spawning not associated with a certain season of the year are registered. In Ha Long Bay, a distinct spawning interruption is observed in all fishes during winter. © 2014, Pleiades Publishing, Ltd.


Emel'yanova N.G.,Moscow State University | Pavlov D.A.,Moscow State University | Pavlov E.D.,RAS Severtsov Institute of Ecology | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2014

We describe anomalies in oocyte structure of manybar goatfish Parupeneus multifasciatus from the coastal zone of southern Central Vietnam. The anomalies are registered in the majority of cells (>80%) from ovarian fragments of several individuals. The abnormal cells are at the periods of maturation, vitellogenesis, and, sometimes, previtellogenesis. Possible effect of pollutants on oocyte morphology is discussed. © 2014 Pleiades Publishing, Ltd.


Pavlov D.A.,Moscow State University | Emel'yanova N.G.,Moscow State University | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2013

The growth of individuals is analyzed in the mass tropical species manybar goatfish Parupeneus multifasciatus from the Nha Trang Bay of the South China Sea. The relationship between the body weight and body length is determined for the females and males. Among the fishes larger 180 mm fork length (FL), the males prevail. Linear growth of the sagitta is characterized by negative allometry in relation to body length, and sagitta growth in length is faster than in width. Age of fish assessed based on the analysis of daily increments on the sagitta does not exceed three years, and the majority of individuals reach the first sexual maturity by the age of one year. The growth rate of the fish is characterized by a large individual variation. © 2013 Pleiades Publishing, Ltd.


Vasil'eva E.D.,Moscow State University | Medvedev D.A.,RAS A.N. Severtsov Institute of Ecology and Evolution | Chi T.T.L.,Russian Vietnamese Tropical Research and Technological Center | Prazdnikov D.V.,RAS A.N. Severtsov Institute of Ecology and Evolution | And 3 more authors.
Journal of Ichthyology | Year: 2013

We performed the first large-scale study of the species structure of the fishes living in the inland water bodies of Phu Quoc Island and identified 97 species of bony fishes, which represent 41 families of 13 orders. Taking into account the results of earlier studies, we compiled a total checklist of the island's ich-thyofauna, which includes 99 species; one more species recorded in a previous publication on the ichthyo-fauna of the island can be added to this number, as well as 15-20 mostly euryhaline species, which needed clarification of their states. Only one species on the checklist, Oreochromis niloticus, has been introduced to the island; 14 species, mostly of the family Gobiidae, have never been recorded in the faunas of other regions of Vietnam. Two new species, probably endemic to the island, have been found and described (in the genera Rasbora and Barbucca). Two more species of the order Siluriformes should probably also be described as new. © 2013 Pleiades Publishing, Ltd.


Emel'yanova N.G.,Moscow State University | Pavlov D.A.,Moscow State University | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2013

Gonadal differentiation and development of sex cells are described in the tropical representative of the family Mullidae, manybar goatfish Parupeneus multifasciatus, using histological methods and observations of oocytes in vivo. Anatomical differentiation of the gonads is registered by approximately 5 cm fork length (FL) and 1.5 g body weight of the fish, and cytological differentiation (in the females) occurs by approximately 6 cm body length and 2.6 g body weight. In the ovaries of sexually mature females before spawning, oocytes of all phases and periods of development can be found. Based on the gonadal structure and frequency distribution of oocyte diameter, the type of oogenesis is continuous. © 2013 Pleiades Publishing, Ltd.


Pavlov D.A.,Moscow State University | Emel'yanova N.G.,Moscow State University | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2015

Otolith morphology and microstructure of the sagitta are described in freckled goatfish Upeneus tragula. The first increments (from the second to sixth or eighth) are the most well defined, and subsequent zones of less contrasting increments are bounded by increments with more contrasting borders. These borders are less expressed close to the edge of the sagitta. The width of the majority of increments ranges from 1.5 to 2.5 μm. Based on the results of the experiments on in vivo marking of the sagittae, daily periodicity of incre_ ment deposition is supported. Age composition of the populations from the coastal zone of Vietnam (Nha Trang and Ha Long bays) is assessed based on the calculation of daily increments. The growth rate of the fishes is characterized by a substantial variation. In Nha Trang Bay, the females grow more rapidly than the males, and the growth rate of the fishes in Nha Trang Bay is lower than that in Ha Long Bay. Maximum age of the fish in both bays is 3 years 99 days and 2 years 129 days, respectively. © Pleiades Publishing, Ltd., 2015.


Emel'yanova N.G.,Moscow State University | Pavlov D.A.,Moscow State University | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2015

Development of sex cells, sperm motility, and initial stages of embryonic development are described in a tropical representative of the family Mullidae, freckled goatfish Upeneus tragula, from the coastal zone of Vietnam. In Nha Trang Bay, the gonads in the majority of sexually mature females are at IV, IV–V, and VI–IV maturity stages over the entire year, and the type of oogenesis is continuous. Anomalous structure of oocytes is registered in 15% of investigated females. In Ha Long Bay, the gonads of almost all sexually mature females are at maturity stage II in December. In adult males, spermatozoa are the most numerous in elongated spermiducts. Based on computer-assisted analysis of motility of spermatozoa removed from a spermiduct and activated in marine water, sperm velocity reaches 53 μm/s in 1 min after activation, and the duration of progressive movements of spermatozoa does not exceed 5 min. © 2015, Pleiades Publishing, Ltd.


Pavlov D.A.,Moscow State University | Ha V.T.,Russian Vietnamese Tropical Research and Technological Center | Thuan L.T.B.,Russian Vietnamese Tropical Research and Technological Center
Journal of Ichthyology | Year: 2012

Otolith morphology and microstructure of the sagitta are described in the mass tropical species manybar goatfish Parupeneus multifasciatus. The hatch check is absent on the sagitta, and the appearance of the first contrasting increment is connected with the transition of the larva to exogenous feeding. The increments are distributed within several concentric zones, and each zone is separated by more pronounced dark areas (in transmitted light) of the increments (checks). The number of increments within a zone is variable; and the modal group (with the exception of the first zone from the primordium to the first check) includes from six to ten increments. In the juveniles, the periodicity of increment formation on the sagitta ranges from <1 to >3 in a day, but it is close to one increment per day in the individuals larger than 86 mm FL and 11 g in weight. The number of increments deposited in a day does not depend on the growth rate or feeding frequency of the juveniles. © 2012 Pleiades Publishing, Ltd.

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