Reproduction Characteristics of Tropical Eel Anguilla bicolor McClelland in Different Developmental Stage

Rachmawati, FN; Sistina, Yulia

doi:10.1088/1755-1315/593/1/012019

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…These results were consistent with an earlier study that reported a lower GSI of A. bicolor collected in an estuary environment (Hagihara et al, 2020). Other sources stated GSI values ranging from 1.04 to 2.96%, 0.1 to 2.88% (Rachmawati and Susilo, 2009;, and 0.03 to 4.37% (Rachmawati and Sistina, 2020) for similar species, which were comparable to the values obtained in this current study. Lower GSI values suggested that A. bicolor gonads were still in the immature stage, as opposed to A. japonica, found with a GSI of 4.3% at the pubertal stage (Kotake et al, 2005).…”

Section: Resultssupporting

confidence: 93%

Comparison of Reproductive Aspects of the Tropical Eel Anguilla bicolor (McClelland 1884) in Freshwater and Estuarine Habitats

Rachmawati,

Susilo,

Aya

2023

Indo. J. Mar. Sci.

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The tropical anguillid eel, Anguilla bicolor McClelland, experiences significant growth up to the adult size in both freshwater and estuarine ecosystems, encountering salinity gradients that may impact their reproduction. Therefore, this study aimed to investigate the reproductive aspects of A. bicolor collected from Serayu River (freshwater) and Segara Anakan (estuary), Cilacap, Central Java, during July 2020 field surveys. The examined parameters included eye index (EI), fin index (FI), gonadosomatic index (GSI), hepatosomatic index (HSI), and sex ratio of eel specimens in freshwater and estuary. Furthermore, the total length (TL) and body weight (BW) ranged from 260 - 630 mm and 18 - 419 g in freshwater, and 260 - 630 mm and 18 - 447 g in estuary. Significant differences (P<0.01) were observed in the reproductive characteristics between the two habitats (P<0.01), with higher eye index, fin index, gonadosomatic index, and hepatosomatic index in freshwater-caught eels than the values obtained in estuary inhabitants. The mean of these four parameters were 6.99 ± 2.98%, 4.08 ± 0.71%, 1.70 ± 1.13%, and 1.92% ± 1.07 in freshwater, while 3.48 ± 1.60%, 3.45 ± 0.479%, 1.12 ± 0.23%, and 0.28 ± 0.19% were found in estuary. The sex ratio was significantly affected by habitat, with female eels dominating in freshwater (62.5%) compared to estuary (32%). These results suggested that eels in freshwater habitats might exhibit early gonadal maturation compared to those in estuary.

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Section: Resultssupporting

confidence: 93%

Comparison of Reproductive Aspects of the Tropical Eel Anguilla bicolor (McClelland 1884) in Freshwater and Estuarine Habitats

Rachmawati,

Susilo,

Aya

2023

Indo. J. Mar. Sci.

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“…Female A. bicolor is more dominant caught in freshwater than an estuary; the results of this study are the same as the observations of [12] and [23]. Female of A. bicolor has a 100% dominant catch in Segara Anakan [12].…”

Section: Sex Ratiosupporting

confidence: 87%

“…Female of A. bicolor has a 100% dominant catch in Segara Anakan [12]. In contrast, in Peninsular Malaysia, 73% females, 13% of males, and 14% of gonads undifferentiated [23].…”

Section: Sex Ratiomentioning

confidence: 99%

Biochemical composition of tropical eel Anguilla bicolor McClelland,1844 in Freshwater and Estuary

Rachmawati

Susilo

2021

E3S Web Conf.

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During migration, Anguilla bicolor will stop its feeding activity and use energy from its body lipid stores. Therefore, information on changes in the body lipid content of eels is essential to know the preparation of spawning migration. Thus, it is interesting to study the body composition of A. bicolor in freshwater and estuaries. This research conducted a survey method. The eel was obtained from the Serayu River (freshwaters) and Segara Anakan (Estuary). The observed variables were water, dry weight, lipid, protein, crude fiber, ash, and BETN of eel. Oneway ANOVA analyzed data. The results show that freshwater eels' average body length and weight were 457.875 cm ± 153.8552 and 224.4375 g ± 165.3735. The body length and weight of the estuary eels were smaller than freshwater eels, which are 372.5714 cm ± 152.6467 and 109.6429 g ± 134.6054, respectively. The body composition of eel, except for lipid content, was similar for both habitats (p>0.05). However, the body lipid content of freshwater eels and the estuarine eel differed (p<0.05), namely 40.15% ± 9.63 and 27.33% ± 9.93, respectively. In conclusion, the lipid body content of freshwater eels was higher than the estuary eel, while another is relatively the same.

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“…It also has plain body skin [10]. The eel stage in this study was classified based on [11] and [12] studies. Tesch [11] classified an elver stage as the eel with a length greater than 7 cm, [12] grouped the yellow eel stage as the eel with a length of 20-45 cm, and eels with a size greater than 45 cm are in the adult/silver eel stage [13].…”

Section: Methodsmentioning

confidence: 99%

Population structure of tropical eel (Anguilla bicolor bicolor) in Cikaso River, West Java

Putri

Syamsudin

2021

E3S Web Conf.

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A. bicolor bicolor is a tropical eel subspecies that dominate catches in the coastal areas of West Java, and its conservation status is near threatened. Cikaso River, West Java, becomes eel migration path, while unfortunately, information concerning the stock of eel in this river is still inadequate. The objective of this study was to determine the population structure (size distribution, length-weight relationship, and condition factor) of A. bicolor bicolor in the Cikaso River. The research was carried out in the main streams of the Cikaso River and the coastal marsh of Ciroyom from January to December 2020. Eel samples were collected using lift-net, fishhook, and traps. The number of eels caught is counted, then the total length and weight are measured. We collected nine elvers and 89 yellow eels, but no silver eel was caught during the study. The elver's total length (TL) ranged from 10.2 to 20 cm, and the TL of yellow eel ranged from 20.1 to 42.2 cm. The catch of eel is dominated by the size of 25-30 cm. The growth pattern of eel in the Cikaso River is positive allometric, with the condition factor of eel ranging from 0.450 to 1.917 (1.160±0.3096).

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Reproduction Characteristics of Tropical Eel Anguilla bicolor McClelland in Different Developmental Stage

Cited by 3 publications

References 13 publications

Comparison of Reproductive Aspects of the Tropical Eel Anguilla bicolor (McClelland 1884) in Freshwater and Estuarine Habitats

Comparison of Reproductive Aspects of the Tropical Eel Anguilla bicolor (McClelland 1884) in Freshwater and Estuarine Habitats

Biochemical composition of tropical eel Anguilla bicolor McClelland,1844 in Freshwater and Estuary

Population structure of tropical eel (Anguilla bicolor bicolor) in Cikaso River, West Java

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