Yield per recruit of the peacock bass Cichla monoculus (Spix and Agassiz, 1831) caught in Lago Grande at Manacapuru (Amazonas – Brazil)

Campos, Caroline Pereira; Freitas, Carlos Edwar de Carvalho

doi:10.1590/1519-6984.17312

Cited by 9 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variants of this model have been intensively studied and used to examine the likely outcomes of a range of minimum‐length and other size‐based harvest limits in exploited stocks, targeted by both commercial and recreational fisheries (e.g. Campos & Freitas, ; Maceina et al, ; Sánchez‐Hernández et al, ; Wolff et al, ).…”

Section: Introductionmentioning

confidence: 99%

Saving large fish through harvest slots outperforms the classical minimum‐length limit when the aim is to achieve multiple harvest and catch‐related fisheries objectives

et al. 2020

View full text Add to dashboard Cite

We address the problem of optimal size-selective exploitation in an age-structured fish population model by systematically examining how density and size dependency in growth, mortality and fecundity affect optimal harvesting patterns when judged against a set of fisheries objectives. The study offers five key insights. First, while minimum-length limits often maximize the biomass yield, exploitation using harvest slots (i.e. regulations that protect both immature and very large individuals) can generate within 95% of maximum yield; harvest slots also generally maximize the number of fish that are harvested. Second, density dependence in growth and sizedependent mortality predict more liberal optimal size limits than those derived under assumptions of no density and size dependence. Third, strong density dependence in growth maximizes the catch of trophy fish only when modest harvest is introduced; the same holds for numbers harvested, when the stock-recruitment function follows the Ricker type. Fourth, the inclusion of size-dependent maternal effects on fecundity or egg viability has only limited effects on optimal size limits, unless the increase in fecundity with mass ("hyperallometry") is very large. However, large hyperallometry in fecundity shifts the optimal size limit for biomass yield from the traditional minimum-length limit to a harvest slot. Fifth, harvest slots generally provide the best compromises among multiple objectives. We conclude that harvest slots, or more generally dome-shaped selectivity to harvest, can outperform the standard minimum-length selectivity. The exact configuration of optimal size limits crucially depends on objectives, local fishing pressure, the stock-recruitment function, and the density and size dependency of growth, mortality and fecundity.

show abstract

Section: Introductionmentioning

confidence: 99%

Saving large fish through harvest slots outperforms the classical minimum‐length limit when the aim is to achieve multiple harvest and catch‐related fisheries objectives

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Overfished inland recreational fisheries, such as the peacock bass (Cichla spp.) in Amazonia waters where they have been heavily exploited by (often tourist) anglers (Allan et al, 2005;Campos and Freitas, 2014). More restrictive harvest or even effort management may be needed if education (e.g., importance of returning large fish) fails to stem overharvest.…”

Section: Restructuringmentioning

confidence: 99%

Resilience Management for Conservation of Inland Recreational Fisheries

et al. 2020

View full text Add to dashboard Cite

show abstract

“…These fisheries use several types of fishing gear and pursue high biodiversity, with more than 200 species or species groups present in landings at the main urban regional centres (Santos et al 2006). The high fishing intensity has already resulted in an overfishing status for several species, including tambaqui, Colossoma macropomum (Cuvier, 1816) (see Mérona andBittencourt 1988, Campos et al 2015); piramutaba, Brachyplatystoma vaillantii (Valenciennes, 1840) (see Barthem et al 1991); piraiba, Brachyplatystoma filamentosum (Lichtenstein, 1819) (see Petrere et al 2004); barba chata, Pinirampus pirinampu (Spix et Agassiz, 1829) (see Sant'Anna et al 2014); and tucunaré, Cichla monoculus Agassiz, 1831 (see Campos and Freitas 2014).…”

Section: Introductionmentioning

confidence: 99%

Stock assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery

Catarino¹,

Kahn²,

Freitas³

2019

Acta Ichthyol. Piscat.

View full text Add to dashboard Cite

assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery. Acta Ichthyol. Piscat. 49 (4): 373-380. Background. Despite the importance of inland fishery, assessments of exploited inland stocks have relied on datadeficient databases, mainly in developing countries. In this paper, we employed two distinct analytical methods to evaluate the stock status of Prochilodus nigricans Spix et Agassiz, 1829, the most important fish in the Amazonian freshwater landings. In this study, we intended to test the sustainability of small-scale fisheries comparing two different methods. Materials and methods. The population dynamic of P. nigricans was studied using length and weight data for fish caught in Manacapuru Lake and the lower stretch of the Solimões River. Estimates of maximum sustainable yield and corresponding fishing mortality for 2012 and 2013, using Beverton-Holt curve, indicated an overfishing status for both years. At the same region, fishers were interviewed and their knowledge on the P. nigricans stock status was assessed using a stock assessment methodology based on fishers' knowledge, known as ParFish. Results. Both yield per recruit curves employed to assess the stock status of P. nigricans in 2012 and 2013 and ParFish approach indicate an overfishing status, but ParFish also found a high uncertainty level around 47%. Conclusion. The use of ParFish algorithm and traditional knowledge can provide qualitatively similar results to conventional models, such as the Beverton-Holt approach. The ParFish approach shows the advantage including confidence intervals to its estimates.

show abstract

Yield per recruit of the peacock bass Cichla monoculus (Spix and Agassiz, 1831) caught in Lago Grande at Manacapuru (Amazonas – Brazil)

Cited by 9 publications

References 9 publications

Saving large fish through harvest slots outperforms the classical minimum‐length limit when the aim is to achieve multiple harvest and catch‐related fisheries objectives

Saving large fish through harvest slots outperforms the classical minimum‐length limit when the aim is to achieve multiple harvest and catch‐related fisheries objectives

Resilience Management for Conservation of Inland Recreational Fisheries

Stock assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery

Contact Info

Product

Resources

About