Ovarian and spawning reference, size at first maturity and fecundity of Glossogobius giuris caught along Vietnamese Mekong Delta

Dinh, Quang Minh; Truong, Ngon Trong; Tran, Nam Sy; Nguyen, Ton Huu Duc

doi:10.1016/j.sjbs.2021.10.030

Cited by 4 publications

(9 citation statements)

References 25 publications

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“…Sex discrimination plays a vital role in the ecology and biology of fish species, especially in the Mekong Delta, a large delta in Vietnam and Southeast Asia with an ichthyofauna of ~200 different fish species, ranging from brackish to freshwater (Tran et al, 2013). Many of them must be killed and their gonads removed to identify their sex, which is a time-consuming activity (Dinh and Le, 2017;Dinh et al, 2021a;Ho et al, 2021;Dinh et al, 2022a;Dinh et al, 2022b). takes time.…”

Section: Introductionmentioning

confidence: 99%

Sex discrimination based on morphological traits in Mystus mysticetus Roberts, 1992

Phan¹,

Tran²,

Lam³

et al. 2022

VIS

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This study supplemented the way of sex determination of fish based on the regression relationship of some morphological indicators of Mystus mysticetus. A total of 425 fish specimens were collected by trawl nets at Cai Rang - Can Tho and Long Phu - Soc Trang from January to July 2022. After collection, the fish were transferred to the laboratory to determine their total length (TL), standard length (SL), eye diameter (ED), eye distance (DE), body height (BD), head length (HL), and mouth width (MD) before anatomy for sex determination based on gonads. The regression analysis results of TL-SL, TL-ED, TL-DE, TL-BD, TL-HL, and TL-MD showed that SL, DE, and MD could be used to determine the sex of this fish species because SL and DE were dominant in growth in males, and MD was prevalent in females. In addition, SL could be used to determine the sampling time and HL to determine the distribution environment.

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Section: Introductionmentioning

confidence: 99%

Sex discrimination based on morphological traits in Mystus mysticetus Roberts, 1992

Phan¹,

Tran²,

Lam³

et al. 2022

VIS

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“…This procedure has been successfully applied to many species in VMD like Periophthalmodon schlosseri (Tran et al, 2019), Glossogobius aureus (Dinh et al, 2021b), Glossogobius sparsipapillus (Nguyen et al, 2019;Nguyen et al, 2021), Butis koilomatodon (Dinh et al, 2021a), Mystus mysticetus (Vo et al, 2022), Periophthalmus chrysospilos (Dinh et al, 2022a), and Glossogobius giuris (Dinh et al, 2022b;Dinh et al, 2022c).…”

Section: Discussionmentioning

confidence: 99%

Procedure for performing a fixed microscopic specimen of the gonads of fish

Dinh

Nguyen

2022

VIS

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This study aims to provide a procedure for performing microscopy in fish gonads. Specimens used in this study were the ovaries and testes of fish collected in the Mekong Delta from April to July 2022. Organs at five different stages for each sex (ovary diameter from 1.16 cm in stage I to 4.04 cm in stage V; testis diameter from 0.42 in stage I to 2.39 in stage V) were studied in this procedure. The results showed that both ovaries and testes needed to be fixed at 4% formol for 24 h and under running water for eight hours. Ovaries and testes were then immersed in 500 ethanol for 24 h to initiate dehydration. Results showed that the time for dehydration and paraffin infiltration was longer in the ovary (26 to 55 h across stages) than in the testis (25 to 26 h across stages). The mean staining time of the ovary was 1.5 min (stage I) to 3.5 min (stage V) in Hematoxylin and 50 s (stage I) to 140 s (stage V) in Eosin. Whereas the staining time of testis was shorter, 1 min (stage I) to 3 min (stage V) in Hematoxylin and 30 s (stage I) to 90 s (stage V) in Eosin. This study provides a reference for further studies on the histological structure of fish gonads. These results could be applied to fish species inside and outside the Mekong Delta.

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“…Changes in L m with salinity have been demonstrated in several other fish species. The L m of G. giuris was adjusted to salinity variation as it matured earlier in saline areas (4.8 cm) than at the sampling sites with year-round freshwater conditions (6.1 cm) ( Dinh et al, 2022c ). In Glossogobius aureus , L m tended to decrease from freshwater (12.5 ± 1.5 cm) to saltwater (10.5 ± 0.3 cm) ( Dinh et al, 2021b ).…”

Section: Discussionmentioning

confidence: 99%

“…Higher fecundity was observed in species such as Pseudapocryptes elongatus (2,100–29,400 egg/female) ( Tran, 2008 ), Boleophthalmus boddarti (9,800–33,800 egg/female) ( Dinh, Nguyen & Nguyen, 2015 ), and Butis koilomatodon 3,085–32,087 egg/female) ( Dinh et al, 2021a ). Moreover, Glossogobius sparsipapillus (8,568–95,191 egg/female) ( Nguyen et al, 2021 ) and Glossogobius giuris (5,118–100,003 egg/female) ( Dinh et al, 2022c ) were two species of goby fish in the family Gobiidae shown to have a high fecundity and roughly equivalent to A. viridipunctatus ( Table 3 ). In particular, Glossogobius giuris distributed in Kissorgonj, Bangladesh displayed fecundity up to 14,987–716,400 eggs/female ( Hossain, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

“…According to Bagenal (1967) , batch fecundity was from the formula: F = (n × G)/g ( F : batch fecundity; n : the number of oocytes in sub-sample; g : the weight of sub-sample; and G : the ovarian weight). The oocyte diameter per ovarian stage, according to Dinh et al (2022c) , was determined by randomly measuring 30 oocytes in each ovary using Motic Image-Pro Plus v.2.0.…”

Section: Methodsmentioning

confidence: 99%

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

Dinh

Nguyen

Truong

et al. 2022

PeerJ

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

show abstract

Ovarian and spawning reference, size at first maturity and fecundity of Glossogobius giuris caught along Vietnamese Mekong Delta

Cited by 4 publications

References 25 publications

Sex discrimination based on morphological traits in Mystus mysticetus Roberts, 1992

Sex discrimination based on morphological traits in Mystus mysticetus Roberts, 1992

Procedure for performing a fixed microscopic specimen of the gonads of fish

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

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