Modeling Growth of the Cortes Geoduck<i>Panopea globosa</i>from Unexploited and Exploited Beds in the Northern Gulf of California

Aragón-Noriega, E. Alberto; Calderón-Aguilera, Luis E.; Pérez-Valencia, Sergio

doi:10.2983/035.034.0115

“…geoduck clam exhibits a longevity of 34 years in the study area (Aragón-Noriega, Calderon- Aguilera & Pérez-Valencia, 2015), late maturity, a low individual growth rate, and a high natural mortality rate for early stages and young individuals (González-Peláez et al, 2015a). These demographic traits make to geoduck susceptible to fishing mortality, negatively affecting its abundance, spatial density, survival and reproduction rates; hence, stock management must avoid significant decreases in abundance.…”

Section: Discussionmentioning

confidence: 99%

“…However, this time horizon is based on geoduck clams distributed in northern latitudes (USA and Canada), where the longevity of this species has been estimated to exceed 100 years (Hoffmann, Bradbury, & Goodwin, 2000;Bureau et al, , 2003. In the study area, the species has exhibited longevity of 34 years (Pérez-Valencia & Aragón-Noriega, 2013;Aragón-Noriega, Calderon-Aguilera & Pérez-Valencia, 2015); therefore, the time horizon associated with the harvest rate should be shorter. According to Zhang & Hand (2006), the ratio ( of current biomass (B t ) to virgin biomass (B 0 ) has the following relationships: ) i) = 0.5; the value represents the biological reference point.…”

Section: Discussionmentioning

confidence: 99%

“…These differences in the maturity size among populations of P. globosa should be taken into account when establishing management strategies, mainly because the maturity size at 50% is positively correlated with its longevity; therefore, individuals mature at a specific fraction of their maximum length (Jensen, 1996;Law, 2000;Nadon & Ault, 2006). For P. globosa, the individual growth is highly variable: in Bahía Magdalena (Pacific coast), geoduck clams exhibited an asymptotic shell length of 179.85 mm (Luquin-Covarrubias et al, 2016); the geoduck population from Guaymas (Central Gulf of California) had an asymptotic length of 122 mm (Cortez-Lucero et al, 2011;Cruz-Vázquez et al, 2012), while in Puerto Peñasco and San Felipe (Upper Gulf of California), the asymptotic length values were 161.79 mm and 190.84 mm, respectively (Aragón-Noriega et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Peer Review #1 of "Evidence of overfishing of geoduck clam Panopea globosa from a length-based stock assessment approach (v0.1)"

Carson¹

2020

0

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Stock assessment of the geoduck clam Panopea globosa in Mexico has been based on data-poor without consideration of the biological traits of the species, promoting a passive management strategy without biological reference points for its harvest and conservation, which results in limited advice regarding the sustainability of the fishery. The stock assessment was supported on an integrated catch-at-size assessment model. The model described the population changes, including recruitment, selectivity, fishing mortality, individual growth patterns and survival over time, providing management quantities for the geoduck clam fishery, such as biomass-at-length (total and vulnerable) and harvest rate-at-length. The results indicated overfishing of the geoduck clam population; the harvest rate exceeded the management tactics established for this fishery, even the individuals smaller than the minimum legal size (130 mm) were harvested. Thus, declines in the total biomass (from 3,262 to 1,130 t) and recruitment (representing an 86% decrease) were observed from 2010 to 2012. Although the results showed a recovery trend in recruitment and total biomass from 2014 to 2016, this trend may have been due to the spatial relocation of fishing mortality.

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“…Aragón-Noriega, Calderon-Aguilera & Pérez-Valencia (2015), and = 0.046 was assigned based on the report by González-Peláez et al (2015a).…”

Section: Parameter Estimationmentioning

confidence: 99%

Peer Review #2 of "Evidence of overfishing of geoduck clam Panopea globosa from a length-based stock assessment approach (v0.1)"

2020

0

View full text Add to dashboard Cite

Stock assessment of the geoduck clam Panopea globosa in Mexico has been based on data-poor without consideration of the biological traits of the species, promoting a passive management strategy without biological reference points for its harvest and conservation, which results in limited advice regarding the sustainability of the fishery. The stock assessment was supported on an integrated catch-at-size assessment model. The model described the population changes, including recruitment, selectivity, fishing mortality, individual growth patterns and survival over time, providing management quantities for the geoduck clam fishery, such as biomass-at-length (total and vulnerable) and harvest rate-at-length. The results indicated overfishing of the geoduck clam population; the harvest rate exceeded the management tactics established for this fishery, even the individuals smaller than the minimum legal size (130 mm) were harvested. Thus, declines in the total biomass (from 3,262 to 1,130 t) and recruitment (representing an 86% decrease) were observed from 2010 to 2012. Although the results showed a recovery trend in recruitment and total biomass from 2014 to 2016, this trend may have been due to the spatial relocation of fishing mortality.

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“…(2010) and later by Luquín‐Covarrubias, Morales‐Bojórquez, González‐Peláez, and Lluch‐Cota (2016), who named it ‘growth depensation’. Using more than one model to describe growth curves in bivalves is very common nowadays (Aragón‐Noriega, 2013; Aragón‐Noriega, Calderon‐Aguilera, & Pérez‐Valencia, 2015; Luquín‐Covarrubias et al., 2016). The restricted calculation facilities of some years ago permitted only limited comparison between two or more growth models (in comparison with the current situation involving advanced computers).…”

Section: Introductionmentioning

confidence: 99%

Modelling early growth of the pearl oyster Pteria sterna under pilot‐commercial production

Hoyos‐Chairez¹,

Aragón-Noriega

²

,

Chávez‐Villalba

³

2020

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The pearl oyster Pteria sterna produces pearls from animals gathered from the wild but spat collection is increasingly unreliable. Therefore, hatchery support is required to supply spat for aquaculture operations. In this study is described the hatchery processes to produce spat of P. sterna in a pilot‐commercial grade. Growth and survival (relative and absolute) are described for the different developmental stages and critical aspects identified. Growth (height and length) was analysed using depensatory hypothesis and the multi‐model inference (MMI). Spat production cycle is described (egg to spat in size and time); spat ≥ 3 mm = 70 days. Average absolute growth rate for shell height was 7.8 µm/day during embryonic phase, 14.5 µm/day during metamorphosis and 71.4 µm/day for post‐larvae phase. Survival was 75% after 48 hr (D‐larvae stage), 25% at day 14 (umbo stage) and 12% at day 28 (pediveliger stage). Metamorphosis was the main critical phase since survival drop to 0.32%. From 32.5 million eggs, 80,000 commercial spat were produced. Early growth in P. sterna showed depensatory pattern since coefficient of variation in height data increased (2%–28%), and this was supported by MMI. The hatchery procedures presented here guarantee the production of spat for aquaculture activities. Growth depensation leads to the application of a high performance function to analyse individual size‐at‐age variability and to parametrize the models without sub underestimation of values. The best fitted model to describe early growth in P. sterna is the Schnute model case 1.

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Modeling Growth of the Cortes GeoduckPanopea globosafrom Unexploited and Exploited Beds in the Northern Gulf of California

Cited by 16 publications

References 24 publications

Peer Review #1 of "Evidence of overfishing of geoduck clam Panopea globosa from a length-based stock assessment approach (v0.1)"

Peer Review #1 of "Evidence of overfishing of geoduck clam Panopea globosa from a length-based stock assessment approach (v0.1)"

Peer Review #2 of "Evidence of overfishing of geoduck clam Panopea globosa from a length-based stock assessment approach (v0.1)"

Modelling early growth of the pearl oyster Pteria sterna under pilot‐commercial production

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