Ovarian traits, spawning pattern and season, length at first maturity, and batch fecundity of (Bleeker, 1852) caught from the Vietnamese Mekong Delta.

has a wide range of distribution, from brackish to freshwater water, ranging from India to the Philippines and Fiji, including the Vietnamese Mekong Delta (VMD), where it lives mainly in the coastal regions and plays a vital role in food supply. Our preliminary observation showed that its population tended to decline, but little is known about this species. This study, therefore, was conducted to provide data on the ovarian structure, spawning pattern and season, length at first maturity, and batch fecundity of this fish.

The reproductive biology of from the Vietnamese Mekong Delta.

The Squaretail mullet, , is a commercial fish species distributed throughout the Indo-Pacific region. This species tolerates wide variations in salinity, having been reported from both freshwater and marine habitats. Although economically significant, there is little information on its reproduction, especially in the Vietnamese Mekong Delta (VMD), where it is heavily extracted.

The use of mtCOI gene sequences in identifying species in the Southwest of Vietnam.

genus is characterised by their small body size and morphological variability, allowing them to adapt to different habitats. This paper analyses the mitochondrial cytochrome C oxidase subunit I gene sequences and morphology of for identification purposes and to understand genetic relationships. The morphological characteristics of differed obviously from and .

Life-history traits of a tropical bagrid catfish, Roberts, 1992, caught from the Mekong Delta, Vietnam.

Population's biological parameters, including length at first capture, mortalities, exploitation rates, growth coefficient, longevity, and recruitment times, are essential in assessing fishing status, but there is no data on . Therefore, the study was conducted to provide these parameters to assess the fishing status of this species at Cai Rang, Can Tho (CRCT) and Long Phu, Soc Trang (LPST). A collection of 741 individual fish was used for analysis and showed that most fish size groups ranged from 9.

Phylogenics of the genus in the Mekong Delta based on the mitochondrial cytochrome () gene.

The species play an essential role in food supply and are distributed widely from the marine to freshwater, especially in the Mekong Delta, Vietnam (VMD). Some of their morphometrics and meristics are observed to vary with species and sampling sites. Therefore, the present study aims to verify if their mitochondrial Cytochrome () gene, one of the popular gene sequences used in fish phylogenic variation assessment, varies with species and sampling sites in the VMD.

Population biology of (Quoy & Gaimard, 1825) in the Mekong Delta, Vietnam.

is widely distributed and plays a vital role in the fisheries in the Mekong Delta (MD), but data on its population biological traits have not been known. Consequently, this study was conducted to provide data on its population biology used for fishing status assessment and fish resources management. Fish specimens were collected using trawl nets in two regions of the Hau River mouth, including northern in Ben Tre and Tra Vinh (BTTV) and southern in Soc Trang and Bac Lieu (STBL).

Burrow behaviour, structure and utilization of the amphibious mudskipper Bleeker, 1853 in the Mekong Delta.

Burrows of fishes are important to their creators, but knowledge of burrowing behaviour, structure and utilization are poorly understood. We report the burrowing behaviour of the amphibious mudskipper, , from estuarine and coastal sites within the Mekong Delta (Vietnam). Activities at and around the burrow were observed over 12 months (April 2020 to March 2021).

Variations in length-weight relationship, growth and body condition of the commercial mullet in the Vietnamese Mekong Delta.

The Squaretail mullet is widely found from marine to brackish and freshwater, including the Vietnamese Mekong Delta (VMD). Data on the length-weight relationships (LWRs), growth pattern, and condition factor (CF) play an essential role in fisheries assessment but are limited to - a commercial fish in VMD. To better understand the growth pattern of this fish, the study collected samples at four sites, including Thanh Phu, Ben Tre (BT); Duyen Hai, Tra Vinh (TV); Tran De, Soc Trang (ST); and Dong Hai, Bac Lieu (BL).

Population dynamics of (Actinopteri: Gobiidae) in the Vietnamese Mekong Delta.

Spotted green goby is one of the commercial gobies living from brackish to freshwater globally, including the Southwest of Viet Nam, but there is no data on population biological traits used for assessing status of stock. Consequently, the research aimed to provide life history parameters of this fish like asymptotic length ( ), growth coefficient indicator (), exploitation rate (), length at first capture ( ), the maximum age ( ), growth coefficient ('), and mortalities. A total 960 individuals (528 males and 432 females) were caught using trawls at two ecoregions, including Tra Vinh-Soc Trang (TVST) and Bac Lieu-Ca Mau (BLCM), from January to December 2020.

Testicular development, reproducing references and length at first maturity of (Actinopteri: Gobiiformes) in the southwest Viet Nam.

This study provided knowledge on testicular development, spawning reference and length at first maturity ( ) of -a target catching fish for food supply in the southwest Viet Nam. A total of 528 individuals were collected using trawl nets from January to December 2020 at Long Huu-Tra Vinh (LHTV), Trung Binh-Soc Trang (TBST), Dien Hai-Bac Lieu (DHBL) and Tan Thuan-Ca Mau (TTCM). Five developmental stages of testis were found, and testis diameter increased from ∼1.

Feeding ecology of (Quoy & Gaimard, 1825) living in the Mekong Delta, Vietnam.

(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.

Ovarian development, spawning season, size at maturity and fecundity of (Valenciennes, 1837) in the Vietnamese Mekong Delta.

This present study provides an overview of the reproductive traits, including ovarian development, spawning season, size at maturity ( ), and fecundity of - 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.

Monthly variations in growth pattern and condition factor of (Gobiiformes: Periophthalminae) living along the Bassac River in Viet Nam.

(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 samples were caught using traps and hands for 24 months, from July 2017 to June 2019, at these five sites.

Population biological traits of Bleeker, 1853 in the Vietnamese Mekong Delta.

is an amphibious 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).

Factors regulating growth pattern and condition factor of an amphibious fish living in the Mekong Delta.

Growth pattern and condition factor () are essential to fish resource assessment but limited to -an amphibious fish living in the mudflats along the Indo-Pacific regions, including the Mekong Delta (MD), Vietnam. This study lasted from April 2020 to March 2021 to verify if their growth pattern and change with sex, size, season, month and site. The total length and weight of 486 individuals (236 females and 250 males) were 2.

Reproduction ecology of an emerging fishery resource, the amphibious mudskipper , in the Mekong Delta.

Populations of , 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 individuals (523 males and 508 females) is 1:1.

Spatiotemporal variations in length-weight relationship, growth pattern and condition factor of Eggert, 1935 in Vietnamese Mekong Delta.

Length-weight relationship (), growth pattern and condition factor () play a vital role in fish resource evaluation and management but data on this is limited for . This is an amphibious fish that lives in the mudflats of the mangrove forests in the Western Pacific regions, including the Vietnamese Mekong Delta (VMD). This paper contributes to the understanding of the , growth pattern and of .

Foraging ecology of the amphibious mudskipper (Gobiiformes: Gobiidae).

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. is an amphibious fish species occurring in the intertidal zone, but data on its diet and foraging ecology is still poorly known. This study on 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.

Land Invasion by the Mudskipper, Periophthalmodon septemradiatus, in Fresh and Saline Waters of the Mekong River.

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 amphibious 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.

Reproductive Traits of the Duckbill Sleeper Butis butis (Hamilton, 1822).

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 individuals (74 females and 99 males) indicate that the sex ratio of this species is close to 1:1.