ORCID Profile
0000-0002-9895-2039
Current Organisation
Can Tho University
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Publisher: Egypts Presidential Specialized Council for Education and Scientific Research
Date: 05-2020
Publisher: ResearchersLinks Ltd
Date: 12-2017
Publisher: Elsevier BV
Date: 11-2022
Publisher: Hindawi Limited
Date: 30-10-2018
DOI: 10.1111/JAI.13521
Publisher: Elsevier BV
Date: 09-2023
Publisher: Springer Science and Business Media LLC
Date: 28-03-2014
Publisher: Egypts Presidential Specialized Council for Education and Scientific Research
Date: 07-05-2020
Publisher: PeerJ
Date: 07-12-2021
DOI: 10.7717/PEERJ.12582
Abstract: The food composition and feeding ecology of fishes living in the intertidal zone play an essential role in understanding the energetic connectivity between terrestrial and aquatic systems. Periophthalmus chrysospilos is an hibious fish species occurring in the intertidal zone, but data on its diet and foraging ecology is still poorly known. This study on Ps. chrysospilos was carried out from April 2020 to March 2021 at four sites within the Mekong Delta estuary to define the influence of spatio-temporal factors on the diet of this species. The diet composition and relative gut lengths (RGLs) of Ps. chrysospilos were analysed in relation to four parameters—sex, size, site, and season. A total of 1,031 in iduals were collected, and their digestive tract lengths were used to calculate the RGL. The digestive tracts of only 546 in iduals were with food items (approximately 1:1 of empty vs full digestive tract) and were subsequently used for further analyses. The ranges in total length and weight in both adult and juvenile in iduals were 3.4–10.6 cm and 0.38–14.13 g, respectively. The RGL values varied with season, fish size and site, but was always lower than 1, indicating a predominantly carnivorous diet. The variability of food items found within the digestive tracts demonstrated its adaptability in pursuing prey items within the limits of the littoral zone, and its importance as a conduit of terrestrial-marine connectivity. This species is characterised as an opportunistic mesopredator feeding primarily on Acetes spp., Uca spp., Dolichoderus sp., and rarely on Polychaeta and Actinopterygii. Other items found within the digestive tract are Mollusca, and detritus. The diet composition of Ps. chrysospilos did not vary with season and size, but changed with sex and site parameters. Uca spp. contributed to the sexual variation in dietary component, whereas Mollusca, Uca spp., Dolichoderus sp. and detritus, were drivers for spatial variation in the dietary component. The research provides fundamental information on diet composition and feeding strategy, as well as contributes towards knowledge on foraging ecology and resource use by intertidal animal communities.
Publisher: Central Marine Fisheries Research Institute, Kochi
Date: 31-03-2018
DOI: 10.21077/IJF.2018.65.1.68188-04
Abstract: Stigmatogobius pleurostigma (Bleeker, 1849) is an estuarine species of goby and widely distributed in Asian regions, but very little is known about the reproductive biological traits of this species. The present study was conducted along the coastline of the Mekong Delta, Vietnam from November 2015 to October 2016 to elucidate basic reproductive parameters of the species. A total of 155 fish (96 females and 59 males) were collected every month using fixed bag nets from the mangrove forests in the study area. Data analysis showed that the sex ratio is significantly different from 1:1. This gobiid species is an iteroparous fish spawning from March to November in the study region as deduced from the appearance of mature and ripe ovaries during this period. The length at first maturity was estimated as 4.14 cm in total length and absolute fecundity was found to be quite high (3,100-5,650 eggs) with a strong positive relationship with fish length and weight. The results obtained in this study contribute to the knowledge on the reproductive biology as well as stock status of the species.
Publisher: Springer Science and Business Media LLC
Date: 19-12-2015
Publisher: Wiley
Date: 2022
DOI: 10.1002/ECE3.8507
Abstract: Populations of Periophthalmus chrysospilos , the Gold‐spotted mudskipper, within the Mekong Delta are facing extirpation risks due to indiscriminate harvesting for the growing aquarium and food‐fish trade. This study provides some of the first information on reproductive ecology—such as spawning type and season, length at first maturity, and batch fecundity—of this species, to be used in their management. The sex ratio of wild populations, based on 1031 in iduals (523 males and 508 females) is 1:1. The gonadosomatic index (GSI) values are exhibit a non‐normal distribution and changed with gender, season, and site. A combination of GSIs and the monthly appearance of mature gonads suggest that this species reproduces throughout the year, with peak from July to October. This species exhibits sexual and spatial variation in size at first maturity ( L m ) as L m is 6.2–8.6 cm in males and 6.4–7.3 cm in females. The batch fecundity ( F = 2614 to 23,465 eggs/female) exhibits non‐normal distribution and varies with site, with the highest values at Dam Doi, Ca Mau (13,336 ± 1,279 SE) and the lowest at Tran De, Soc Trang (6654 ± 851 SE). In addition, batch fecundity is directly proportional to body size due to high determination relationships between batch fecundity and fish size ( r 2 0.64 for all cases). Information derived on the reproductive biology of this species can inform its conservation, sustainable exploitation, and ex situ propagation.
Publisher: Elsevier BV
Date: 10-2022
Publisher: Central Fisheries Research Institute (SUMAE)
Date: 2015
Publisher: Elsevier BV
Date: 11-2022
Publisher: Wiley
Date: 16-11-2020
DOI: 10.1111/AZO.12286
Publisher: Wiley
Date: 09-2022
DOI: 10.1002/ECE3.9352
Abstract: Ellochelon vaigiensis (squaretail mullet) adapts to a wide salt spectrum, grows quickly and is easy to raise with other species, so it is the object of attention in aquaculture. Information on the biology and ecology of the species, diet, in particular, is still scattered. Here, we explore the feeding habit, feeding intensity, and food composition of the squaretail mullet. A total of 942 fish (526 males and 416 females) were collected from November 2020 to October 2021 at four coastal sites in the Mekong Delta, Vietnam. The squaretail mullet is an algi‐omnivorous fish, as their relative gut length (1.81) falls into the range 1–3, and the diet is mostly based on algae. The feeding intensity is high due to the high value of the fullness index (4.39 ± 0.08%). The fullness index did not vary by s ling site and month, while RGL and FI changed depending on sex. Bacillariophyta (49.13%), detritus derived from organic matter (30.37%), and Cyanophyta (18.39%) are the dominant food items in the diet composition of E. vaigiensis , in which detritus is the most important food with the highest IRI index. Besides, Euglenophyta (1.00%), Chlorophyta (0.95%), Paramecium (0.06%), Copepoda (0.04%), Rotatoria (0.03%), Polychaeta (0.02%), and Cladocera (0.01%) are also recorded and ranked based on their biovolume. Some differences in diet composition are observed between immature and mature at different seasons and their interactions. Our results increase the knowledge about the feeding ecology of squaretail mullet and can help the sustainable management of this commercially important fish species.
Publisher: Egypts Presidential Specialized Council for Education and Scientific Research
Date: 24-03-2020
Publisher: Springer Science and Business Media LLC
Date: 02-10-2019
DOI: 10.1038/S41598-019-50799-5
Abstract: There has been a long-standing controversy about whether vertebrates emerged in the Paleozoic from marine or freshwater environments. Several hypotheses have proposed coastal, estuarine and riparian areas as sites of the transition. Here, we report the ecology of an hibious fish Periophthalmodon septemradiatus , which we presume is in the process of niche expansion into terrestrial habitats from estuarine to freshwater environments along the Mekong River, Vietnam. Adult fish are highly terrestrial and have not been observed to venture into water during our survey. Courtship behaviour was observed, and fertilised eggs were recovered from burrows in both brackish and freshwater environments. The smallest fish collected at 12, 96, and 148 km from the river mouth were juveniles shortly after starting an hibious life. These findings suggest reproduction in both brackish and freshwater environments. In contrast, otolith Sr:Ca ratio indicates larval hatching only in brackish water. Analysis of a 940-base pair (bp) segment of the mitochondrial cytochrome c oxidase subunit II and a 934-bp segment of the mitochondrial D-loop demonstrated no genetic segregation between populations. The fish may provide a unique opportunity to study how ambient salinity affects the biology and ecology of a living vertebrate during transition from water to land.
Publisher: PeerJ
Date: 20-04-2022
DOI: 10.7717/PEERJ.13289
Abstract: Periophthalmus chrysospilos is an hibious fish living in mudflats from eastern India to Indonesia, including the Vietnamese Mekong Delta. Population biological traits play an important role in fishery assessment, but understanding is limited for this species. In total 1,031 specimens were caught in two regions covering four provinces, including the TVST (Duyen Hai, Tra Vinh and Tran De, Soc Trang) and BLCM (Dong Hai, Bac Lieu and Dam Doi, Ca Mau). Results found that the sex ratio was close to 1:1. The parameters of the von Bertalanffy in TVST were L ∞ = 12.8 cm, K = 0.41 yr −1 , t 0 = −0.10 yr and in BLCM were 12.7 cm, 0.38 yr −1 and −0.08 yr, respectively. Although the growth coefficient ( Φ′ ) in BLCM (1.79), was lower than that in TVST (1.83), the species shared a similar size at first capture (7.9 cm in TVST and 7.9 cm in BLCM). The species suffered from heavy pressure of fishing in TVST as fishing mortality in TVST (2.32 yr −1 ) was higher than that in BLCM (1.38 yr −1 ), leading to the higher total mortality ( Z = 3.60 yr −1 ) in TVST compared to BLCM (Z = 2.59 yr −1 ). By contrast, the species showed similar natural mortality over both sites (1.20 yr −1 in TVST and 1.22 yr −1 in BLCM). The Periophthalmus chrysospilos population was reasonably exploited because E values (0.64 in TVST and 0.53 in BLCM) were lower than E 10 (0.706 in BTTV and 0.705 in STBL). Nonetheless, to avoid the consequences of overfishing, some sustainable fisheries practices should be implemented, such as protecting mangrove forests, restricting fishing during the recruitment period, using appropriate fishing tools and increasing mesh size.
Publisher: Springer Science and Business Media LLC
Date: 23-10-2015
Publisher: Zoological Society of Japan
Date: 10-2017
DOI: 10.2108/ZS170013
Abstract: Butis butis is a commercially important goby that is widely distributed in Indo-Pacific regions however, its reproductive biology is poorly characterized. We condcted the present study in estuarine and coastline areas in the Mekong Delta from June 2015 to May 2016 to generate reproductive parameters for this species. The results of data analysis based on a collection of 173 in iduals (74 females and 99 males) indicate that the sex ratio of this species is close to 1:1. Mature (stage IV) and ripe (stage V) gonads were found monthly during the study period, suggesting that Butis butis is an iteroparous fish that spawns in a year-round cycle. Male B. butis matures first at 8.97 cm total length (TL), which is longer than females (6.82 cm TL). Butis butis is well adapted to tropical monsoon regions due to its high batch fecundity (46,017 ± 6941 SE), ranging from 15,000 (8.6 cm TL and 5.71 g W) to 78,500 (15.8 cm TL and 42.24 g W) eggs. Batch fecundity increases with fish size due to a strong positive relationship between batch fecundity and fish size (TL and W). These results help fill the knowledge gap on the reproductive biology of Butis butis, and contribute crucial information relevant to sustainable management of fish populations in the study region.
Publisher: PeerJ
Date: 12-08-2022
DOI: 10.7717/PEERJ.13880
Abstract: Periophthalmodon septemradiatus (Hamilton, 1822) is a unique mudskipper living in the mudbanks from estuarine to riverine regions in the Vietnamese Mekong Delta (VMD), but there is no data on its growth patterns and condition factors that are helpful for fish resource assessment and adaptation understanding. This study was conducted at five sites, from the lower (Soc Trang province) to middle (Can Tho city) and upper (An Giang province) reaches of Bassac River in VMD, to provide knowledge on growth patterns and condition factors to this mudskippers. Fish s les were caught using traps and hands for 24 months, from July 2017 to June 2019, at these five sites. The total length and weight of 3,417 in iduals (1,340 females and 2,077 males) varied by sex, season and site ( p 0.001 for all cases). This species exhibited a positive allometric type as the slope ( b = 3.06 ± 0.01) of the length-weight relationship (LWR) was ( p 0.001) for both sexes. The growth pattern changed with sex as mudskipper showed isometry in females but positive allometry in males. Maturity also affected fish growth type since it shifted from negative allometry in immature groups to positive allometry in mature groups. The growth pattern of fish changed from isometry in the dry season to positive allometry in the wet season. The mudskipper showed isometry at the lower reaches in Soc Trang but positive allometry at the middle and upper reaches in Can Tho and An Giang. The condition factor (CF) did not change according to sex, size and season, but with month and site variables. The present environmental condition in these studied sites tended to be not good enough for this fish as CF (0.95 ± 0.01) was less than 1 ( p 0.001). The findings provided basic information on the growth and adaptation of P. septemradiatus being helpful in fish adaptation understanding and resource conservation in VMD.
Publisher: PeerJ
Date: 22-09-2022
DOI: 10.7717/PEERJ.14077
Abstract: This present study provides an overview of the reproductive traits, including ovarian development, spawning season, size at maturity ( L m ), and fecundity of Acentrogobius viridipunctatus – a high economic value fish in the Vietnamese Mekong Delta (VMD). A total of 432 females were collected using trawl nets from January to December 2020 at four sites, including Long Huu-Tra Vinh (LHTV), Trung Binh-Soc Trang (TBST), Dien Hai-Bac Lieu (DHBL), and Tan Thuan-Ca Mau (TTCM). The ovarian diameter was seen to increase from 2.09 (stage I) to 6.57 mm (stage V). Histological analysis showed that the goby was a multi-spawner due to the different oocyte stages found in stages IV and V of ovaries. It can release eggs all year-round due to the monthly appearance of ovarian stages IV and V during the study period, with the main peak in the 2–4 months of the wet season noted with the highest value of gonadosomatic index at that time. The L m increased from 6.6 cm at TBST to 9.4 cm at TTCM. This species displayed relatively high fecundity, ranging from 5,481 to 130,683 eggs/female. The average fecundity of this fish was 27,698 ± 7,983 eggs/female at LHTV, 46,592 ± 7,264 eggs/female at TBST, 23,271 ± 4,985 eggs/female at DHBL, and 31,408 ± 2,515 eggs/female at TTCM. Egg diameter ranged from 0.45 ± 0.01 at DHBL to 0.50 ± 0.01 at TBST. For sustainable exploitation, local governments should ask the fishers to avoid catching fish during the main spawning period, and the fish length at first capture should be L m .
Publisher: Wiley
Date: 23-12-2020
DOI: 10.1111/JZO.12861
Publisher: Springer Science and Business Media LLC
Date: 27-10-2016
No related grants have been discovered for Quang Dinh.