Population dynamic of Periophthalmodon septemradiatus (Hamilton, 1822) living along the Hau River, Vietnam

“…Periophthalmus chrysospilos displayed high fishing mortality, resulting from human activity affecting their habitat. However, the natural mortality rate of this fish is quite low compared to some other mudskipper species such as P. barbarus (1.35) ( Etim, King & Udo, 2002 ), P. novemradiatus (3.39) ( Rahman et al, 2015 ), P. waltoni (1.58) ( Sharifian et al, 2018 ), P. serperaster (1.51) ( Dinh, Qin & Tran, 2015 ), P. septemradiatus (3.14) ( Tran & Dinh, 2020 ). This suggests that P. chrysospilos was inhabiting good environmental conditions.…”

Section: Discussionmentioning

confidence: 90%

“…For example, the K values of P. papillo in Cross River, Nigeria ( Etim, Brey & Arntz, 1996 ), P. barbarus in Nigeria ( Etim, King & Udo, 2002 ), P. novemradiatus in Cox’s Bazar, Bangladesh ( Rahman et al, 2015 ) and P. waltoni in Hormozgan Province, Persian Gulf ( Sharifian et al, 2018 ) were 0.51, 0.55, 1.5 and 0.68, respectively. The K value of P. chrysospilos was lower than that of some mudskippers, e.g ., Boleophthalmus boddarti in Mekong Delta (0.79) ( Dinh, 2017 ), P. septemradiatus also in Mekong Delta (0.49) ( Tran & Dinh, 2020 ), P. schlosseri in Malaysia (1.40) ( Mazlan & Rohaya, 2008 ). It was recognized that P. chrysospilos had a slower growth rate than other species in the genus Periophthalmus .…”

Section: Discussionmentioning

confidence: 99%

“…From these data, it can be seen that in the same genus, but with different environments, the age of fishing was also different. However, within the same area, the catching ages of some other oxudercinae fish living in the Mekong Delta were younger than P. chrysospilos , due to their lower L c /L ∞ , e.g ., Parapocryptes serperaster (0.57) ( Dinh, Qin & Tran, 2015 ), P. septemradiatus (0.55) ( Tran & Dinh, 2020 ). Some other fish species in the Mekong Delta also had this ratio lower than P. chrysospilos such as Pseudapocryptes elongatus (0.45) ( Tran et al, 2007 ), Trypauchen vagina (0.57) ( Dinh, 2018b ), Butis butis (0.44) ( Dinh, 2018a ), Stigmatogobius pleurostigma (0.44) ( Dinh & Nguyen, 2018 ) and B. koilomatodon (0.44) ( Dinh et al, 2020a ).…”

Section: Discussionmentioning

confidence: 99%

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

Dinh

Nguyen

et al. 2022

PeerJ

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Periophthalmus chrysospilos 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). 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, t0 = −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 E10 (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.

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“…It feeds mainly on detritus, Dolichoderus sp., Uca spp., molluscs, Acetes spp., and small fishes ( Dinh et al, 2020b ). This mudskipper spawns monthly a year-round in burrows made by males ( Dinh et al, 2020a ) and reaches 12.6 cm in total length and a maximum lifespan of ~6 years ( Tran & Dinh, 2020 ). Males are more colourful than females, and male morphology can change from golden brown to iridescent black-green during spawning ( Dinh, Tran & Nguyen, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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

Dinh

Nguyen

Truong

et al. 2022

PeerJ

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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 samples 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 individuals (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 >3 (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.

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Population dynamic of Periophthalmodon septemradiatus (Hamilton, 1822) living along the Hau River, Vietnam

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Population Biological Parameters of Ambassis vachellii (Perciformes: Ambassidae) Caught from Bay Hap and Cua Lon Estuaries, Ca Mau Province, Vietnam

Population Biological Parameters of Ambassis vachellii (Perciformes: Ambassidae) Caught from Bay Hap and Cua Lon Estuaries, Ca Mau Province, Vietnam

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

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

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