Estimating mortality for the assessment of a small-scale fishery: Lane snapper (Lutjanus synagris) in Honduras

Castillo, Liliana Sierra; Pawluk, Michaela; Fujiwara, Masami

doi:10.1016/j.fishres.2020.105709

Cited by 3 publications

(7 citation statements)

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“…Each indicator was determined for the data belonging to Lane Snapper ( Lutjanus synagris ) caught with gill nets of 2” and 3” mesh size. The selectivity bias associated for each mesh size was corrected by fitting different distribution curves (a.k.a selectivity curves) to the length-specific CPUE of each mesh size, this was done using a maximum likelihood method (as described in more detail in [ 33 ] Sierra Castillo et al, (2020)).…”

Section: Methodsmentioning

confidence: 99%

“…For this study, we assumed that the values of L ∞ of 51.6 cm and k of 0.23 estimated for Puerto Rico for Lane Snapper ( Lutjanus synagris ) were the same for our population and that they remained constant through the study [ 36 ] (Acosta & Appeldoorn, 1992). Different natural mortalities estimated for Lane Snapper ( Lutjanus synagris ) by [ 33 ] Sierra Castillo et al, (2020) were used to assess the impact on the optimal length estimation (Appendix A). A range ±10% of the optimal length—as proposed by [ 2 , 10 , 14 ] Babcock et al, (2013), Cope and Punt (2009), and Froese (2004)—was used to determine the percentage of the catch that falls within the optimal length.…”

Section: Methodsmentioning

confidence: 99%

“…Because we have different L opt ranges (according to the natural mortality estimates used), we used the highest L opt value and estimated the percentage of “ mega spawners ”. We did not include the L opt estimated based on the method of Peterson and Wroblew ski ( L opt > 35 cm) because of its poor performance [ 33 ](Sierra Castillo et al, 2020). The expected percentages of “mega spawners” should be between 30% and 40% for a healthy stock without overfishing.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, recruitment overfishing and growth overfishing are occurring with the stock [8,14,37] (Froese, 2004;Froese et al, 2018;Froese et al, 2012). Agreeing with [33] Sierra Castillo et al, (2020), there seems to be high fishing pressure (resulting in high fishing mortalities), which is currently causing the overfishing. Because of this, we recommend that managers work alongside fishermen to enforce the existing fishing regulations, such as the ban on gill nets of mesh size 2".…”

Section: Plos Onementioning

confidence: 99%

“…(Acosta & Appeldoorn, 1992). Different natural mortalities estimated for Lane Snapper (Lutjanus synagris) by[33] Sierra Castillo et al, (2020) were used to assess the impact on the optimal length estimation (Appendix A). A range ±10% of the optimal length-as proposed by [2, 10, 14] Babcock et al, (2013),Cope and Punt (2009), and Froese (2004)-was used to determine the percentage of the catch that falls within the optimal length.…”

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confidence: 99%

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Assessment of a small-scale fishery: Lane Snapper (Lutjanus synagris) using a length metric method

Castillo

Fujiwara

2021

PLoS ONE

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Small-scale fisheries are hard to assess because of the limited availability of data. Therefore, a method requiring easy-to-obtain catch-data is important for the assessment and management of small-scale fisheries. The objective of this study was to assess the effect of fishing gear selectivity on a length-based metric method proposed by Froese by estimating three indicators using catch-data from Lane Snapper (Lutjanus synagris) collected in Honduras. These indicators are (1) the percentage of mature individuals in the catch, (2) the percentage of fish within the range of estimated optimal lengths to be captured, and (3) the percentage of fish larger than the optimal length. These indicators determine the level of overfishing. The indicators were estimated separately for catch-data corresponding to gill nets, and each indicator was estimated with and without selectivity correction. Selectivity and mesh sizes of the fishing gear had a major impact on the estimation of indicators 1 and 2. As for indicator 3, it consistently showed a high level of exploitation. The three estimated indicators suggested that the Lane Snapper fishery in Honduras is experiencing overfishing. Overall, the method appears to be promising for the assessment of small-scale fisheries, but it should be used cautiously.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

mentioning

confidence: 99%

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Assessment of a small-scale fishery: Lane Snapper (Lutjanus synagris) using a length metric method

Castillo

Fujiwara

2021

PLoS ONE

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Geographic variation in the life history of lane snapper Lutjanus synagris, with new insights from the warm edge of its distribution

Andrade

Vihtakari

Santos

2023

Journal of Fish Biology

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Research on life‐history variations in widely distributed fish species is needed to understand global warming impacts on populations and to improve fisheries management advice. The lane snapper Lutjanus synagris (Linnaeus, 1758) is commercially important to fisheries in the Western Central Atlantic, where spread information on its life‐history traits is available. We studied growth, age, reproduction and mortality of lane snapper in the Guatemalan Caribbean, the warmest part of its distribution range, and collated the new information with published data in a latitudinal analysis extending between 18°S and 30°N. Longevity was estimated at 11 years, and von Bertalanffy growth parameters were asymptotic length (Linf) 45.6 and 42.2 cm for females and males, respectively, the growth coefficient (K) was 0.1 year−1 and the theoretical age at zero length (t0) was −4.4 years. Lane snapper grew slowest in April, prior to the rainy season, and at the onset of the reproductive season, which lasted from May to October. Fifty percent of female and male lane snappers matured at 23 and 17 cm, corresponding to 3.5 and 2.4 years of age respectively. A regional multivariate analysis found seawater temperature to be an important driver of life‐history variation. Lane snapper lifespan was shorter at the warm edge of its distribution range, and maximum size and peak reproductive investment were negatively related to sea surface temperature. The trade‐offs in lane snapper life‐history traits and phenology likely enhance its fitness to differing environments. Interpolation from the present regional estimates to less‐studied regions of the Caribbean is useful for preliminary understanding of reaction norms and harvest potentials.

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Length-Based Spawning Potential Ratio (LB-SPR) for Red Grouper (Epinephelus morio) and Associated Species in the Commercial Fishery of the Yucatan Peninsula, Mexico

Rincón‒Sandoval,

López‒Rocha

2024

Journal of Applied Ichthyology

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The study calculated the Length-Based Spawning Potential Ratio (LB-SPR) for several species, including red grouper (Epinephelus morio), black grouper (Mycteroperca bonaci), gag grouper (M. microlepis), yellowtail snapper (Ocyurus chrysurus), lane snapper (Lutjanus synagris), hogfish (Lachnolaimus maximus), and white grunt (Haemulon plumierii). Data were obtained from the small-scale commercial fleet operating in the red grouper fishery on the Campeche Bank within the Yucatan Peninsula. Monthly records of total length (cm) from April 2017 to May 2018, totaling 10,182 fish, were collected from five fishing ports along the Yucatan Peninsula coast. Biological data, such as growth and reproductive patterns and exploitation parameters were gathered from scientific literature. The LB-SPR package on the R Core Team platform was utilized for analysis. Despite being the largest, groupers exhibited immaturity (SL50<L50) and low Spawning Potential Ratio (SPR). Red and black groupers showed particularly low SPR values (0.10 and 0.05, respectively), indicating a looming risk of local extinction. The gag grouper achieved the highest SPR value (0.26) among groupers, although it was very close to the minimum critical value (i.e., 0.20). Snappers, hogfish, and white grunt were generally captured in the adult state (SL50>L50). Yellowtail, hogfish, and white grunt displayed high SPR values (0.44, 0.72, and 0.98, respectively). Lane snapper had a low SPR (0.28) but fell within the range for maintaining satisfactory stock productivity, albeit with reduced yields. The findings emphasize the urgent need to adjust the current management framework for the red grouper fishery, focusing on improving fishing gear selectivity to address heightened pressure on both juvenile groupers and adult lane snapper. Implementing these measures is crucial to mitigate the risks of local extinction and population decline for each species.

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Estimating mortality for the assessment of a small-scale fishery: Lane snapper (Lutjanus synagris) in Honduras

Cited by 3 publications

References 48 publications

Assessment of a small-scale fishery: Lane Snapper (Lutjanus synagris) using a length metric method

Assessment of a small-scale fishery: Lane Snapper (Lutjanus synagris) using a length metric method

Geographic variation in the life history of lane snapper Lutjanus synagris, with new insights from the warm edge of its distribution

Length-Based Spawning Potential Ratio (LB-SPR) for Red Grouper (Epinephelus morio) and Associated Species in the Commercial Fishery of the Yucatan Peninsula, Mexico

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