Female reproductive biology of the silverside Odontesthes regia

Plaza, Guido; Espejo, Victor; Almanza, Viviana; Claramunt, Gabriel

doi:10.1016/j.fishres.2011.06.009

Cited by 6 publications

(4 citation statements)

References 35 publications

(38 reference statements)

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“…Fishers operated mainly with standardized gillnets (SUB-PESCA 2003), and the average length comparison with data of Pavez et al ( 2008) could be correct. In addition, larger specimens collected in autumn and winter could be associated with the pre-reproductive and beginning of the reproductive cycle (Plaza et al 2011). Besides, lengthweight relationships were similar between males and females, but the expected body weight was lowest in autumn and the highest in summer, coinciding with better conditions for feeding (Iriarte et al 2007(Iriarte et al , 2011 and with results reported by Gómez- Alfaro et al (2006) in Pisco, Peru.…”

Section: Discussionsupporting

confidence: 61%

“…20 cm in 2019 would indicate a sensible reduction in fecundity due to the repetitive removal of larger female individuals in the past. Partial fecundity as a function of total length was demonstrated for sea silverside in the study area byPlaza et al (2011), and for the sea silverside in Peru (GómezAlfaro et al 2006). However, the reduction in the SPR to 58% (IC: 50-70%) obtained by applying the LBSPR method should consider the caveat of this…”

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confidence: 81%

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A data-limited approach to determine the status of the artisanal fishery of sea silverside in southern Chile

et al. 2022

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Artisanal fisheries are essential, but for most the status of the stock supporting the fishing activity remains unknown due to lack of data and difficult access to sampling. For example, the artisanal fishery of sea silverside Odontesthes (Austromenidia) regia, in the Los Lagos administrative region of Chile, requires a data-limited approach to determine its status because the fishery administration has not invested in its monitoring. The approach consisted of estimating the spawning potential ratio (SPR) from length-frequency data collected in 2019 using length-based spawning potential ratio (LBSPR) and biological reference points using the only-catch optimized method (OCOM) to catch data covering from 1960 to 2020. In addition, five age-structured sea silverside populations were simulated considering uncertainty in recruitment and utilizing life-history parameters estimated by FishLife. According to LBSPR, the SPR was 0.58 (95% confidence intervals: 0.5-0.7), suggesting a fully exploited fishery status. The OCOM result was inconsistent with the life-history parameters and was discarded as a valid sea silverside stock assessment. The age-structured population simulations indicated evidence of a reduction in the spawning stock biomass close to 75% of the unexploited condition in 1960. Thus, the underexploited status reached a probability close to 49.4%, and the fully exploited status was 41.2%. The framework for a data-limited stock-assessment approach and results obtained here for the sea silverside are starting essential steps that may be emulated in other artisanal data-limited fisheries.

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Section: Discussionsupporting

confidence: 61%

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confidence: 81%

A data-limited approach to determine the status of the artisanal fishery of sea silverside in southern Chile

et al. 2022

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“…The presence of two distinct classes of oocytes occurring simultaneously in the ripe ovaries of the species gives an indication that the species is a discontinuous spawner. The species exhibits group-synchronous ovarian development with determinate fecundity (Plaza et al, 2011). The greater number of females with ripe ovaries within the month of February indicates a higher proportion of hydrated oocytes in the species.…”

Section: Discussionmentioning

confidence: 95%

Reproductive biology of Blackchin tilapia, Sarotherodon melanotheron (Pisces: Cichlidae) from Brimsu Reservoir, Cape Coast, Ghana

Mireku¹,

Blay²,

Yankson³

2016

Int. J. Fish. Aquac.

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This study described some aspects of the reproductive biology of Blackchin tilapia (Sarotherodon melanotheron, Cichlidae) from Brimsu reservoir. A total of 457 specimens were sampled using a monofilament gill net of mesh size 25 mm from September, 2009 to September, 2010. Standard length for the species ranged between 7.5 and 17.6 cm, with both males and females having a unimodal modal length of 10.0 to 10.9 cm. The length at sexual maturity (L 50) was 11.26 and 11.34 cm for males and females, respectively. The pattern of fluctuation in gonadosomatic index indicates that the species had an extended spawning season starting from February to August.

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“…It is important to know the egg diameter at mature stages since the increase in egg diameter is associated with egg development (Dorostghoal et al, 2009;Plaza et al, 2011;Milton et al, 2018). In order to measure the egg diameters, 1,500 eggs were sampled from the ovary of each fish (500 eggs each from the anterior, middle, and posterior parts of the ovary), and measured under a light microscope using an eyepiece micrometer scale to 25 µm.…”

Section: Measurement Of Egg Diameter and Frequency Distribution Analysismentioning

confidence: 99%

Reproductive Characteristics of the Pond-Farmed Sultan Fish (Leptobarbus hoevenii)

Srithongthum

Amornsakun

et al. 2021

JIPK

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Highlight ResearchThe reproductive characteristics of L. hoevenii were examinedThe potentially smallest maturity sizes of female and male L. hoevenii were 350 g and 180 g, respectivelyThe fecundity of a 1,000 g L. hoevenii can be more than 100,000 eggsL. hoevenii was determined as a multiple spawnerAbstractSultan fish (Leptobarbus hoevenii) is a high value freshwater fish, cultured in some Southeast Asian countries, including Malaysia and Thailand. However, information on its reproductive characteristics is very scarce. This study examined the gonadosomatic index (GSI), fecundity, egg diameter, and determined whether L. hoevenii is a single- or multiple-spawner. Twenty male and female pond-farmed L. hoevenii broodstock were obtained to measure their total length (TL), body weight (BW) and gonad weight to calculate the GSI. Ten females were randomly sampled from the 20 to determine their fecundity. A total of 1,500 eggs were sampled from each female. The egg diameter was measured then its frequency distribution was analyzed to detect the number of egg class group, and to determine whether L. hoevenii is a single- or multiple spawner. The female L. hoevenii examined were 32.2-47.1 cm and 350-1,200 g, while the males were 30.7-45.8 cm and 180-970 g in TL and BW, respectively. All female specimens contained gonads. The potentially smallest mature samples were recorded at 350 g (female) and 180 g (male). GSI for the female and male L. hoevenii were 1.81-12.28 % and 1.03-5.09 %, respectively. The fecundity was 35,467 -128,067 eggs, while the highest fecundity was observed in a 1,000 g fish. The observed egg diameter ranged from 500 to 1,855 μm. Two to five groups of egg class were detected, indicating that L. hoevenii is a multiple spawner.

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Female reproductive biology of the silverside Odontesthes regia

Cited by 6 publications

References 35 publications

A data-limited approach to determine the status of the artisanal fishery of sea silverside in southern Chile

A data-limited approach to determine the status of the artisanal fishery of sea silverside in southern Chile

Reproductive biology of Blackchin tilapia, Sarotherodon melanotheron (Pisces: Cichlidae) from Brimsu Reservoir, Cape Coast, Ghana

Reproductive Characteristics of the Pond-Farmed Sultan Fish (Leptobarbus hoevenii)

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