scholarly journals Development of the silver eel (Anguilla marmorata) gonad during downstream migration in the Lake Poso system, Central Sulawesi

2021 ◽  
Vol 322 ◽  
pp. 01012
Author(s):  
Gadis Sri Haryani ◽  
Triyanto ◽  
Octavianto Samir ◽  
Lukman ◽  
Hidayat ◽  
...  
Keyword(s):  
Gonad Development ◽  
Stage Iv ◽  
Downstream Migration ◽  
Hydropower Plant ◽  
Silver Eel ◽  
Reproductive Process ◽  
Essential Information ◽  
Anguilla Marmorata ◽  
Vitellogenic Stage ◽  
Central Sulawesi

The Lake Poso system is located in Central Sulawesi and is connected to the Tomini Bay by the Poso River. It is known that five out of nine Indonesian eel species were found at the Poso River. Anguilla marmorata is the most caught species. However, uncontrolled catching during downstream migration and the construction of a hydropower plant threaten the silver eel in the Lake Poso system. Research on silver eel (A. marmorata) in Lake Poso was conducted to determine and compare the condition of gonad development as part of the reproductive process. This represents essential information in eel fisheries management in Lake Poso. The eels were collected through bamboo traps (waya masapi). The present study calculates the GSI and HSI values, and histological analyses characterize the gonad. The GSI of eel ranges from 1.95 to 5.69%, and the HSI value ranges from 0.83 to 1.16%. Histological observation showed that eels from Tentena (Lake Poso outlet) and from the estuary of Poso River have ovaries in the early vitellogenic stage (III) and the vitellogenic stage (IV).

scholarly journals Fishways as Downstream Routes in Small Hydropower Plants: Experiences with a Potamodromous Cyprinid

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1041
Author(s):  
Francisco Javier Sanz-Ronda ◽  
Juan Francisco Fuentes-Pérez ◽  
Ana García-Vega ◽  
Francisco Javier Bravo-Córdoba
Keyword(s):  
General Assumption ◽  
Downstream Migration ◽  
Life Cycles ◽  
Hydropower Plant ◽  
Small Hydropower ◽  
Pit Tag ◽  
Safe Alternative ◽  
Hydropower Plants ◽  
Longitudinal Connectivity ◽  
Alternative Routes

Fish need to move upstream and downstream through rivers to complete their life cycles. Despite the fact that fishways are the most commonly applied solution to recover longitudinal connectivity, they are not considered viable for downstream migration. Therefore, alternative facilities are recommended to facilitate downstream migration. However, a few recent studies have disagreed with this general assumption, showing the potential for bidirectional movements. This study advances our understanding of the potential of fishways for downstream migration by studying their efficiency in a run-of-the-river hydropower plant in the Duero River (Spain). To achieve this, downstream movements of the Iberian barbel (n = 299) were monitored in a stepped fishway for two years with passive integrated transponder (PIT)-tag technology, considering the effect of fish origin and release zone. The results showed that 24.9% of barbels descended through the fishway, with the origin and release zone affecting the fishway location. In addition, downstream movements were observed throughout the whole year, except in winter. The study concludes that, under specific scenarios, fishways could act as safe alternative routes for downstream migration.

scholarly journals Eel (Anguilla spp.) fishing activity in Poso Area Central Sulawesi, Indonesia

2021 ◽  
Vol 869 (1) ◽  
pp. 012022
Author(s):  
L Lukman ◽  
T Triyanto ◽  
G S Haryani ◽  
O Samir ◽  
L Gogali ◽  
...  
Keyword(s):  
Secondary Data ◽  
Downstream Migration ◽  
Primary Data ◽  
Shallow Waters ◽  
Fishing Gear ◽  
Fishing Activity ◽  
Central Sulawesi

Abstract Poso in Sulawesi, primarily the Lake Poso and Poso River, is known as eel (Anguilla spp.) fishing areas. Therefore, research of eel fishing is required as base information for evaluating and determining policies for its activities. The eel fishing research in the Poso area was conducted through primary data observations, secondary data traces, and interviews from April to June 2021. The fishing activities take place in the Lake Poso and Poso River shore and the rivers of the lake inlets. The fishing gear that contributed greatly to the catch was fence traps and spears. The local community’s fence trap called waya is a unique gear only found in this area, and it is installed in Poso River around the lake outlets. The gears block the rivers to catch downstream migration eels. The spear is fishing gear (including for eels) operated at night in shallow waters, especially in the outlets of Lake Poso. The eel production recorded from the Poso areas for the last four years has been 6.7–15.5 tons per year, and the highest production was in Pamona Puselemba.

scholarly journals Species composition of glass eels (Anguilla spp.) recruiting to the Palu River, Central Sulawesi

2018 ◽  
Author(s):  
Novalina Serdiati ◽  
Samliok Ndobe ◽  
Abigail Moore ◽  
Deddy Wahyudi
Keyword(s):  
Species Composition ◽  
Dna Analysis ◽  
Temporal Patterns ◽  
Clove Oil ◽  
Analysis Method ◽  
Substantial Variation ◽  
Anguilla Marmorata ◽  
Glass Eels ◽  
Central Sulawesi ◽  
Tropical Eel

Demand for tropical eel seed has been increased and many tropical eel populations are under pressure. To conserve eel biodiversity and manage eel populations sustainably, it is necessary to identify eel species and their recruitment patterns at regional and watershed scales. The research objective was to determine the species composition and temporal recruit-ment patterns of glass eels recruiting to Palu River in Central Sulawesi. Glass eels sampling were conducted in January-April 2009, May-November 2010 and April-December 2011. Identification under anaesthetic (15-17.5 ppm clove oil solution) was based mainly on the number of ano-dorsal vertebrae (ADV). Species composition was dominated by two commercially species, Anguilla marmorata and A. bicolor pacifica with substantial variation and no clear temporal patterns. Specimens of other species that important from conservation and biodiversity aspects were present at each month but cannot be accurately identified using the ADV method. DNA analysis method is required to identify these specimens.

Silver eel downstream migration in the River Rhine, route choice, and its impacts on escapement: A 6-year telemetry study in a highly anthropized system

2018 ◽  
Vol 123 ◽  
pp. 202-211 ◽  
Author(s):  
Thomas Trancart ◽  
Stéphane Tétard ◽  
Anthony Acou ◽  
Eric Feunteun ◽  
Frédéric Schaeffer ◽  
...  
Keyword(s):  
Route Choice ◽  
Downstream Migration ◽  
River Rhine ◽  
Silver Eel

scholarly journals Histological and histochemical analysis of the gonadal development of males and females of Armases rubripes (Rathbun 1897) (Crustacea, Brachyura, Sesarmidae)

2009 ◽  
Vol 69 (1) ◽  
pp. 161-169 ◽  
Author(s):  
CM. Santos ◽  
GV. Lima ◽  
AA. Nascimento ◽  
A. Sales ◽  
LMY. Oshiro
Keyword(s):  
Gonad Development ◽  
Stage Iv ◽  
Cell Types ◽  
Gonadal Development ◽  
Development Stage ◽  
Seminiferous Tubules ◽  
Histochemical Analysis ◽  
Gradual Process ◽  
Histological Aspect ◽  
Different Cell Types

The objective of this study was to provide information on the histological characteristics of the gonads of male and female Armases rubripes crabs, and to try to establish a relationship between the microscopic and macroscopic stages previously identified. Thirty-six crabs were collected by hand between February 2003 and January 2004 in banks of Spartina alterniflora on Sahy Beach in Mangaratiba, Rio de Janeiro state, Brazil. The histological analysis of the ovaries of A. rubripes demonstrated a gradual process of development of the oocytes. According to their cellular characteristics, five types of cells were distinguished: oogonia, oocyte I, oocyte II, oocyte III and oocyte IV. The ovaries showed four stages during gonadal activity: stage I (rudimentary), stage II (developing or maturing), stage III (developed or mature) and stage IV (resting). The results of the histochemical analyses showed that the ovaries vary according to the gonad development stage. The histological aspect of one section of the male gonad was always the same in all of the seminiferous tubules, where the lumen of these tubules always contained spermatozoa and/or spermatids. It was not possible to characterize the three stages of gonad development in the males. This agrees with previous reports in the literature. However, in the females there was a relationship between the gonad stages distinguished macroscopically and the results obtained through the histological and histochemical analysis, due to the presence of different cell types, as well as the lysis process and reabsorption of the oocytes in spent females.

scholarly journals VITAMIN A OF EEL FISH (ANGUILLA MARMORATA) FROM PALU RIVER AND POSO LAKE

2018 ◽  
Vol 2 (1) ◽  
pp. 24
Author(s):  
Jamaluddin Jamaluddin ◽  
Agustinus Widodo ◽  
Nurul Mufliha
Keyword(s):  
Fatty Acids ◽  
Vitamin A ◽  
High Performance ◽  
Sampling Technique ◽  
Silver Eel ◽  
Glass Eel ◽  
Yellow Eel ◽  
Anguilla Marmorata ◽  
Phase Glass ◽  
Materials Used

Background & Objective: Eel fish (Anguilla marmorata) has high nutritional or nutrition advantages such as protein, minerals, fatty acids and one of them is vitamin A. This study aims to compare the amount vitamin A of eel fish (Anguilla marmorata) phase glass eel, yellow eel, silver eel from Palu River and Lake Poso.  Materials and Methods: The materials used in this research are eel fish (Anguilla marmorata) Glass eel, Yellow eel, Silver eel size from Palu River and Lake Poso, Ethanol, KOH, n-Hexane, BHT (Butyl Hydroxyl Toluene), Methanol. The sampling technique uses purposive sampling based on the type of weight, size and location of the taking. The method used is High Performance Liquid Chromatography (HPLC) where previously conducted saponification test (saponification) on sample of eel fish. Results: The result of vitamin A test on eel fish from Palu River phase of glass eel is 4.01 mg / kg (1336,67 IU / 100 gram), yellow eel 7,26 mg / kg (2420 IU / 100 gram), silver eel equal to 9.73 mg / kg (3243,34 IU / 100 gram). Vitamin A in eels from Lake Poso phase of glass eel of 0.22 mg / kg (73.34 IU / 100 gram), yellow eel 7.16 mg / kg (2386.67 IU / 100 gram), silver eel of 11 , 3 mg / kg (3766.67 IU / 100 gram). Conclusion: vitamin A of eel fish content from Palu River and Lake Poso were significantly different, which was based on p <0,05

Studi Perbandingan Kandungan Vitamin B Ikan Sidat (Anguilla marmorata (Q.) Gaimard) Fase Yellow Eel dan Silver Eel Asal Sungai Palu Sulawesi Tengah

2020 ◽  
Vol 4 (2) ◽  
pp. 120-130
Author(s):  
Jamaluddin Jamaluddin ◽  
Agustinus Widodo ◽  
Natasha Setiawan
Keyword(s):  
Vitamin B12 ◽  
Vitamin B1 ◽  
Vitamin B ◽  
Vitamin B2 ◽  
Vitamin B3 ◽  
Silver Eel ◽  
Purposive Sampling ◽  
Yellow Eel ◽  
Anguilla Marmorata

Ikan sidat (Anguilla marmorata (Q.) Gaimard) memiliki keunggulan gizi atau nutrisi yang tinggi seperti protein, asam lemak, dan vitamin. Penelitian ini bertujuan untuk membandingkan kadar vitamin B (B1, B2, B3, B5, B6, B7, B9, dan B12) pada ikan sidat fase yellow eel dan silver eel asal Sungai Palu Sulawesi Tengah. Metode yang digunakan yaitu purposive sampling berdasarkan pada tempat, ukuran, dan fase ikan. Hasil pengujian vitamin B (B1, B2, B3, B5, B6, dan B9) menggunakan Kromatografi Cair Kinerja Ultra menunjukkan bahwa vitamin B2 fase yellow eel sebesar 0,07 mg/100 g; silver eel sebesar 0,05 mg/100 g; vitamin B3 fase yellow eel sebesar 0,3 mg/100 g; silver eel sebesar 1,16 mg/100 g; dan untuk vitamin B1, B5, B6, dan B9 tidak terdeteksi kadarnya. Sedangkan pengujian vitamin B7 dan B12 menggunakan Kromatografi Cair-Spektrometri Massa menunjukkan bahwa vitamin B7 fase yellow eel sebesar 58,35 µg/100 g; silver eel sebesar 10,61 µg/100 g; vitamin B12 fase yellow eel sebesar 0,52 µg/100 g; dan silver eel sebesar 0,27 µg/100 g. Kesimpulan yaitu vitamin B7 dengan menggunakan Kromatografi Cair-Spektrometri Massa memiliki kadar vitamin tertinggi sebesar 58,35 µg/100 g pada fase yellow eel dan untuk vitamin B3 (Nicotinamide) menggunakan Kromatografi Cair Kinerja Ultra memiliki kadar vitamin terendah sebesar 0,3 mg/100 g pada fase yellow eel.

Reproductive biology of the four dominant species of catfish from the Persian Gulf

2020 ◽  
Vol 70 (2) ◽  
pp. 131-143
Author(s):  
Farideh Mohseni ◽  
Tooraj Valinassab ◽  
Ehsan Ramezani-Fard ◽  
S.M. Reza Fatemi ◽  
Mohammad Seddiq Mortazavi
Keyword(s):  
Sex Ratio ◽  
Breeding Season ◽  
Persian Gulf ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Common Species ◽  
Hepatosomatic Index ◽  
Essential Information ◽  
Total Length ◽  
The Persian Gulf

Abstract Catfish are an important component of demersal fisheries in the Persian Gulf. This study describes reproductive aspects in the four common species of catfish, namely Netuma thalassina (Rüppell, 1837), Netuma bilineata (Valenciennes, 1840), Plicofollis dussumieri (Valenciennes, 1840), and Plicofollis layardi (Günther, 1866) collected from coastal areas of the Persian Gulf during spring and winter 2017. A total of 495 fishes were collected, including 151 N. thalassina, 12 N. bilineata, 212 P. dussumieri, and 120 P. layardi. The four species showed significant differences in total length as a measure of body size. Total length of these four species also differed significantly between the four seasons and between the sexes. Three species, i.e., N. thalassina, P. dussumieri, and P. layardi showed an overall female-biased sex ratio, while the sex ratio of N. bilineata did not differ from the expected equal proportions. The patterns of gonad development, gonadosomatic index, and hepatosomatic index of the four species showed that the breeding season of N. thalassina, P. dussumieri, and P. layardi was probably during winter. N. bilineata showed a different pattern; its breeding season is therefore expected to be spring. The size at first maturity of N. thalassina, P. dussumieri, N. bilineata, and P. layardi, was 44.99, 30.55, 29.60, and 27.01 cm, respectively. This study provides essential information for correct management during the reproductive cycle to maintain a healthy stock of these fishes.

Sign in / Sign up

Export Citation Format

Share Document