Age at maturity, skipped spawning, and fecundity of female sablefish (Anoplopoma fimbria) during the spawning season

Rodgveller, Cara J.; Stark, James W.; Echave, Katy B.; Hulson, Peter-John F.

doi:10.7755/fb.114.1.8

Cited by 16 publications

(27 citation statements)

References 8 publications

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“…The thickness of the ovarian wall has been used in several fish taxa, including Sablefish (Rideout and Tomkiewicz 2011;Rodgveller et al 2016), to determine if a fish has previously spawned and if it is skip spawning. Each sample included a portion of the ovarian wall.…”

Section: Methodsmentioning

confidence: 84%

“…Each sample included a portion of the ovarian wall. Previously, Rodgveller et al (2016) found that oocyte development did not vary among locations in both ovaries. A "thin" ovarian wall is easy to discern from a "thick" ovarian wall for Sablefish: in Rodgveller et al (2016) an immature mean wall width was 35 lm (95% CI = 30-41 lm) and the mean wall width for a skip spawning fish was 318 lm (95% CI = 267-370 lm).…”

Section: Methodsmentioning

confidence: 99%

“…The annual commercial ex-vessel value in the federal fisheries in Alaska in 2016 was US$93 million (Hanselman et al 2017). They spawn in the late winter or early spring in Alaska (Sigler et al 2001;Rodgveller et al 2016) and are batch spawners with group-synchronous oocyte development and determinate fecundity (a fixed number of oocytes mature as a single cohort and immature oocytes are not recruited throughout ovarian development) (Hunter et al 1989). They spawn in the late winter or early spring in Alaska (Sigler et al 2001;Rodgveller et al 2016) and are batch spawners with group-synchronous oocyte development and determinate fecundity (a fixed number of oocytes mature as a single cohort and immature oocytes are not recruited throughout ovarian development) (Hunter et al 1989).…”

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confidence: 99%

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A Comparison of Methods for Classifying Female Sablefish Maturity and Skip Spawning Outside the Spawning Season

Rodgveller

2018

Mar Coast Fish

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Ovarian development in Sablefish Anoplopoma fimbria was classified using three methods for samples collected during July and August in the Gulf of Alaska, approximately 6–8 months prior to spawning. Although not an ideal time for predicting future spawning, this is when survey platforms, such as longline and trawl vessels, are available annually. The three maturity classification methods included (1) macroscopic classification at sea by trained scientists but with these personnel varying throughout the survey period, (2) macroscopic classification after the survey from photographs by a single, highly trained scientist (standardized macroscopic), and (3) a microscopic evaluation of ovarian structures from histological slides. Based on certain oocyte development characteristics, the second half of August was identified as the time period when maturity could be the most accurately classified in the Gulf of Alaska. Age and length at maturity were estimated to be earlier or smaller, respectively, on some portions of the survey, when macroscopic at‐sea methods were used as opposed to standardized macroscopic or microscopic methods. Skip spawning was documented throughout the survey but at a lower rate than was reported in other studies (2% versus 6% and 21%), indicating that the rate of skip spawning is likely variable. The results demonstrate that accurate maturity classifications may be determined from collections during nonpreferable months when histology or the standardized macroscopic method is used. Identifying skip spawning is likely reliant on microscopic analysis, and so a combination of the standardized macroscopic method along with limited histological sampling, to identify skip spawning rates or to classify maturity when there is uncertainty at sea, may be the most time‐ and cost‐effective option for species similar to Sablefish that skip spawn.

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Section: Methodsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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A Comparison of Methods for Classifying Female Sablefish Maturity and Skip Spawning Outside the Spawning Season

Rodgveller

2018

Mar Coast Fish

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“…We began our conceptual life‐history model by first identifying each life‐history stage that could potentially contribute to determining the size of each sablefish year class, beginning with female condition prior to the start of the spawning season (Table ). The energetic status of females may influence their propensity to spawn, and the quality and number of eggs produced (Rodgveller, Stark, Echave, & Hulson, ; Sogard, Berkeley, & Fisher, ). Thus, the summer and fall prior to spawning (June–December) may be important for female preconditioning.…”

Section: Methodsmentioning

confidence: 99%

“…Prey availability (H1) during the months prior to spawning (June–December) may affect female condition and in turn, egg quality, egg production or even the probability of spawning in a given year. For example, given poor prey availability, individual sablefish in Alaskan waters may skip spawning in some years (Rodgveller et al., ). We included the abundance of age‐0 hake Merluccius productus (Prey hake ) and age‐0 longspine thornyhead Sebastolobus altivelis (Prey lsp ) from their most recent stock assessments (Stephens & Taylor, ; Taylor, Grandin, Hicks, Teylor, & Cox, ) as indices of prey abundance for female sablefish.…”

Section: Methodsmentioning

confidence: 99%

Oceanographic drivers of sablefish recruitment in the California Current

Tolimieri

Haltuch

Lee

et al. 2018

Fisheries Oceanography

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Oceanographic processes and ecological interactions can strongly influence recruitment success in marine fishes. Here, we develop an environmental index of sablefish recruitment with the goal of elucidating recruitment‐environment relationships and informing stock assessment. We start with a conceptual life‐history model for sablefish Anoplopoma fimbria on the US west coast to generate stage‐ and spatio‐temporally‐specific hypotheses regarding the oceanographic and biological variables likely influencing sablefish recruitment. Our model includes seven stages from pre‐spawn female condition through benthic recruitment (age‐0 fish) for the northern portion of the west coast U.S. sablefish stock (40°N–50°N). We then fit linear models and use model comparison to select predictors. We use residuals from the stock‐recruitment relationship in the 2015 sablefish assessment as the dependent variable (thus removing the effect of spawning stock biomass). Predictor variables were drawn primarily from ROMS model outputs for the California Current Ecosystem. We also include indices of prey and predator abundance and freshwater input. Five variables explained 57% of the variation in recruitment not accounted for by the stock‐recruitment relationship in the sablefish assessment. Recruitment deviations were positively correlated with (i) colder conditions during the spawner preconditioning period, (ii) warmer water temperatures during the egg stage, (iii) stronger cross‐shelf transport to near‐shore nursery habitats during the egg stage, (iv) stronger long‐shore transport to the north during the yolk‐sac stage, and (v) cold surface water temperatures during the larval stage. This result suggests that multiple mechanisms likely affect sablefish recruitment at different points in their life history.

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The Reproductive Biology of Female Atlantic Herring in U.S. Waters: Validating Classification Schemes for Assessing the Importance of Spring and Skipped Spawning

Wuenschel

Deroba

2019

Mar Coast Fish

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Atlantic Herring Clupea harengus are iteroparous (repeat spawners) with group‐synchronous oocyte development and determinate fecundity, and they are total spawners. However, they also exhibit plasticity in other aspects of their reproductive biology including spawning seasonality and skipped spawning. Previous studies in other regions have reported skipped spawning and errors in macroscopic classifications of maturity, both of which could bias estimates of reproductive potential, but a critical assessment of these in U.S. waters is lacking. In the Gulf of Maine and Georges Bank, herring are assessed as a single stock complex, where females typically mature as 3 to 4 year olds and may live up to 11 years. To evaluate the magnitude of skipped spawning, we collected the ovaries of Atlantic Herring from fishery‐dependent and fishery‐independent sources over multiple seasons and evaluated them histologically to assess imminent (indicated by vitellogenic or maturing oocytes) or recent spawning (evidenced by the presence of postovulatory follicles). Gonad histology allowed us to determine spawning seasonality and skipped spawning. Macroscopic maturity classification was more accurate in fall (1–4% incorrect maturity) than in spring (7% incorrect maturity). The spatial distributions of immature and mature fish from both fishery‐dependent and fishery‐independent sources differed, which affected the estimation of maturity at length and age. We estimated 9–14% spring spawners in the region, but we did not find evidence of skipped spawning. The time series of the macroscopic data that were available (1987–2018) showed increases in spring spawning with latitude, but the proportions have not changed much over recent decades. The effects of up to 30% spring or skipped spawning on a stock assessment of Atlantic Herring were evaluated. Spring spawning had little effect relative to assuming 100% fall spawning (the current assumption), and skipped spawning decreased the scale of spawning stock biomass (SSB) and related reference points, with the degree of change increasing with skipped spawning rates, but it had few consequences otherwise.

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Age at maturity, skipped spawning, and fecundity of female sablefish (Anoplopoma fimbria) during the spawning season

Cited by 16 publications

References 8 publications

A Comparison of Methods for Classifying Female Sablefish Maturity and Skip Spawning Outside the Spawning Season

A Comparison of Methods for Classifying Female Sablefish Maturity and Skip Spawning Outside the Spawning Season

Oceanographic drivers of sablefish recruitment in the California Current

The Reproductive Biology of Female Atlantic Herring in U.S. Waters: Validating Classification Schemes for Assessing the Importance of Spring and Skipped Spawning

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