Length-weight relationships of eight Asian freshwater fish species in Nam Theun 2 Reservoir (Laos PDR)

Prigent‐Tessier, Anne; Guillard, Jean; Chanudet, Vincent; Cottet, Maud

doi:10.1111/jai.13341

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…The reservoir fish stock and its dynamics have been assessed by scientific fish survey monitoring combined with hydro-acoustic surveys [23,24]. Monitoring started in 2008 prior to reservoir impoundment and used experimental gillnet surveys [30]; lengthweight relationships and life traits were also collected [31][32][33]. Results illustrate a typical three-phase process [34], with a trophic explosion and the proliferation of some species (2008-2009), followed by a rapid trophic depletion within a few months (2009-2010) and then a stabilization with a reduced variability and the dominance of very few species: five species make up to 94% of the total catch [30].…”

Section: Fish Surveysmentioning

confidence: 99%

A Case Study of Fisheries Governance and Management in a Reservoir of Lao PDR: Perspectives for Improvement

et al. 2021

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The focus is on the fishery as a whole, i.e. the combination of fish, environment, fishers, and economic and policy context [11,12]. The need to integrate customer demand and marketing to sustainable fisheries management is highlighted in several studies, in particular in the Mekong basin [13]. Thus, we consider here fish supply, fish demand/marketing and the environment policy as the three main pillars of a sustainable fishery, knowing that several other factors such as biological productivity, algae blooms, limnological aspects, landuses in the catchment areas, fishing gears are also important [14]. Our study focuses only on a reservoir fishery, it does not include upstream or downstream fisheries. We set the stage by identifying the various components of a generic tropical reservoir fishery, and then document how much is known and has been done about each component in the case of Nam Theun 2. This highlights strengths and weaknesses in the knowledge base needed for the management of the system. Ultimately, the various degrees of control of managers over the fishery system and its components are identified. Components of a Fishery: the Conceptual PerspectiveThis case study review is based on the analysis of Nam Theun 2 environment, fish resource, fishing, fishers, fish trade, and policies

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Section: Fish Surveysmentioning

confidence: 99%

A Case Study of Fisheries Governance and Management in a Reservoir of Lao PDR: Perspectives for Improvement

et al. 2021

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“…For the analysis of length-at-age, 258 Nile tilapia individuals were randomly selected from the fish landing in 2016, and from experimental fishing. Age was determined for each individual by counting annuli on the otoliths after validation of only one annulus formation per year (Tessier et al, 2017).…”

Section: Biological Parametersmentioning

confidence: 99%

“…A virtual population analysis (VPA) estimated the tilapia stock (biomass, population size (N)) at the NT2 Reservoir from fish landing data and parameters determined above. For the biomass estimation, the standard length-weight relationship for these Tilapia was calculated with (5): (Tessier et al, 2017)).…”

Section: Virtual Population Analysis Fish Stock and Fishing Managementmentioning

confidence: 99%

Investigating key biological parameters of Nile tilapia (Oreochromis niloticus L.) in a large Asian reservoir to better develop sustainable fisheries

Beaune

Guillard²,

Cottet³

et al. 2020

Hydroécol. Appl.

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The Nile tilapia (Oreochromis niloticus) was introduced in Southeast Asia, such as in Thailand, in the mid-1960s for aquaculture purposes (Pullin et al., 1997; De Silva et al., 2004). The species was later promoted for aquaculture development in the early 1990s in Lao PDR (Garaway et al., 2000). In Lao People’s Democratic Republic (PDR), like in other countries, this exotic species is well established due to its self-reproduction (De Silva et al., 2004; CABI, 2018) facilitated by its particular life history traits and plasticity (Ishikawa et al., 2013). The species was then suspected to be introduced in the seventies in Laos and subsequently in the Nam Theun watershed where the NT2 Reservoir was impounded in 2008. Population parameters of this alien fish were investigated using the FiSAT II software with the most popular methods of bioparameters assessment to check their interchangeability within a same stock and the same year 2016. The length-at-age data analysis (using otoliths analysis, N = 258) gave slightly different results with the length frequency distribution analysis of fish landings (11 820 individuals). Furthermore, experimental fishing data provided irrelevant parameters due to insufficient representativeness of the sample size. The growth parameter K was estimated to be 0.23 year−1, with asymptotic length L∞ = 52.5 cm based on the length frequency distribution analysis with the fish landing data. According to these landing data, the total, natural and fishing mortality were Z = 1.41 year−1, M = 0.30 year−1 and F = 1.11 year−1. The exploitation rate E = 0.79 is over the Emax = 0.594 obtained by relative yield and biomass per recruit. This estimated stock of 165 tons (more than 700 000 tilapias) was characterized by high mortality (no population growth). These results showed that the population is overfished with too many juveniles caught (L50 = 210.4 mm; 50% mature stages at 295 mm). To maximize the yield per recruit, increase the biomass and sustain this fishery, enlarging the gillnet mesh size of the gill-net is recommended. This example highlights the variability of the parameters calculated from different methods and thus weaken worldwide and even inter-site comparisons. Despite this issue, the Growth Performances Indices (φ′) gathered into the literature can serve as baseline and confirmed the wide phenotypic plasticity of the species due to environmental factors. Analyses revealed difference between fast growing domesticated fish rose for aquaculture with φ′ higher to the tilapia growing in natural and challenging environments.

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“…and most known as bada fish in Sumatra while in Java known as paray or wader fish. The natural distribution of R. argyrotaenia Blkr including Sumatra, Kalimantan and Java [4]. The R. argyrotaenia Blkr in Sumatra also used for consumption that has high economic value.…”

Section: Introductionmentioning

confidence: 99%

Food Habit and Feeding Habit of The Silver Rasbora (Rasbora Argyrotaenia Blkr) In Waters of Sungai Dua Village, Downstream of Komering River, South Sumatra

Ridho

Setiawan

Sarno

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The research about food habit and feeding habit of The Silver Rasbora (R. argyrotaenia Blkr) in the waters of Sungai Dua Village, Downstream of Komering River, South Sumatra was conducted in December 2016 until November 2017. The aims of this research were to determine food habit and feeding habit of The R. argyrotaenia Blkr in waters of Sungai Dua Village, Downstream of Komering River, South Sumatra. The 94 Samples of fish were collected by using purposive sampling method with six sampling sites. This research was carried out by examining the gut contents of The R. argyrotaenia Blkr. Organisms in gut content were observed and identified, also measured of total length and weight of the The R. argyrotaenia Blkr. Based on the analysis result of gut contents, The R. argyrotaenia Blkr categorized as plankton feeder. Importance Relative Index (IRI) showed the main food of The R. argyrotaenia Blkr is phytoplankton from taxa Diatomae (454.38-3197.31%) and complimentary food is zooplankton from taxa Entomostraca (14.61-423.15%).

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Length-weight relationships of eight Asian freshwater fish species in Nam Theun 2 Reservoir (Laos PDR)

Cited by 5 publications

References 14 publications

A Case Study of Fisheries Governance and Management in a Reservoir of Lao PDR: Perspectives for Improvement

A Case Study of Fisheries Governance and Management in a Reservoir of Lao PDR: Perspectives for Improvement

Investigating key biological parameters of Nile tilapia (Oreochromis niloticus L.) in a large Asian reservoir to better develop sustainable fisheries

Food Habit and Feeding Habit of The Silver Rasbora (Rasbora Argyrotaenia Blkr) In Waters of Sungai Dua Village, Downstream of Komering River, South Sumatra

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