Jui‐Han Chang

National Chung Cheng University

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Deborah R. Hart

NOAA National Marine Fisheries Service Northeast Fisheries Science Center

Yong Chen

Stony Brook University

Daphne Munroe

Rutgers, The State University of New Jersey

Burton Shank

NOAA National Marine Fisheries Service Northeast Fisheries Science Center

Enrique Curchitser

Rutgers, The State University of New Jersey

Lai‐Kwan Chau

National Chung Cheng University

Kwang‐Ming Liu

National Taiwan Ocean University

Chun‐Jen Huang

Chung Yuan Christian University

Kisei R. Tanaka

NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center

Carl Wilson

Maine Department of Marine Resources

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University of Maine

National Oceanic and Atmospheric Administration

National Chung Cheng University

NOAA National Marine Fisheries Service Northeast Fisheries Science Center

NOAA National Marine Fisheries Service

Duke University

Woods Hole Oceanographic Institution

Marine Conservation Institute

Shanghai Ocean University

Nanjing Tech University

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Using an individual-based model to simulate the Gulf of Maine American lobster (Homarus americanus) fishery and evaluate the robustness of current management regulations

Canadian Journal of Fisheries and Aquatic Sciences (2018)

Mackenzie Mazur Bai Li Jui‐Han Chang Yong Chen

Individual-based models (IBMs) can capture complex processes with a flexible probabilistic approach, which makes them useful for studying organisms with complex life history and fishery processes such as the American lobster (Homarus americanus). This research aims to modify and parameterize an individual-based lobster simulator (IBLS) to simulate the American lobster fishery in the Gulf of Maine. To simulate the fishery, the IBLS was tuned to match the seasonal catch and size composition from the 2015 American lobster stock assessment by adjusting the values of coefficients for select parameters. With appropriate coefficients for the initial abundance, recruitment, and seasonal encounter probability levels, the tuned IBLS accurately simulated the historical landings. Given the uncertainty in future American lobster recruitment, the tuned IBLS was then used to evaluate the effectiveness of current management regulations under different levels of recruitment.

American lobster

Stock assessment

Stock (firearms)

10.1139/cjfas-2018-0122

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Citations (15)

Combining imperfect automated annotations of underwater images with human annotations to obtain precise and unbiased population estimates

Methods in Oceanography (2016)

Jui‐Han Chang Deborah R. Hart Burton Shank Scott M. Gallager P K Honig

10.1016/j.mio.2016.09.006

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Citations (2)

Original and Bias-corrected ROMS Bottom Temperature and Salinity in the Mid-Atlantic Bight

Figshare (2021)

Jui‐Han Chang Deborah R. Hart Daphne Munroe Enrique Curchitser

The original and GAMM RK bias-corrected ROMS daily bottom temperature and salinity from 1980 to 2015 in the Mid-Atlantic Bight (latitude: 35-41.5 N; longitude: 70-76 W; depth: 10-160m).

Header:YearMonthDateLat: LatitudeLon: LongitudeDepth: Depth (meter)TempPred: Original ROMS bottom temperature prediction (degree C)SalPred: Original ROMS bottom salinity prediction (ppt)BiasCorrectedTempPred: GAMM OK bias-corrected ROMS bottom temperature prediction (degree C)BiasCorrectedSalPred: GAMM OK bias-corrected ROMS bottom salinity prediction (ppt)

Temperature salinity diagrams

10.6084/m9.figshare.14245796

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Stock assessment of the shortfin mako shark (Isurus oxyrinchus) in the Northwest Pacific Ocean using per recruit and virtual population analyses

Fisheries Research (2009)

Jui‐Han Chang Kwang‐Ming Liu

Overexploitation

10.1016/j.fishres.2009.04.005

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Citations (35)

Incorporating spatial heterogeneity and environmental impacts into stock-recruitment relationships for Gulf of Maine lobster

ICES Journal of Marine Science (2021)

Mackenzie Mazur Kisei R. Tanaka Burton Shank Jui‐Han Chang Cameron T. Hodgdon

ABSTRACT Functional stock-recruitment relationships (SRRs) are often difficult to quantify and can differ over space. Additionally, climate change adds to the complexity of recruitment dynamics. This paper's aim was to incorporate spatial heterogeneity and environmental effects on productivity in SRRs with American lobster in the Gulf of Maine (GOM) as a case study. GOM lobster recruitment has substantially increased since the mid-2000s, due to improved survival rates of pre-recruits and increased spawning stock biomass (SSB). GOM bottom water temperatures have increased at a rate of 0.2ºC per decade, which caused lobster settlement area to expand and improved survival rates. We first estimated local SSB using bottom trawl survey data and a geostatistical model. Using estimated SSB, recruitment data from a ventless trap survey, and an interpolated bottom water temperature field, we developed modified Ricker stock-recruitment models accounting for spatial heterogeneity and temperature impacts with varying coefficient generalized additive models. Results showed that temperature significantly impacted recruitment. Changes in temperature mediated productivity differed between the eastern and western GOM. Our study demonstrated that the incorporation of spatial heterogeneity and environmental effects impacts our understanding of SRRs. These methods can be applied to other species to understand recruitment dynamics influenced by climate change.

Stock (firearms)

Spatial heterogeneity

Stock assessment

10.1093/icesjms/fsab266

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Citations (6)

ROMS-MAB

Figshare (2021)

Jui‐Han Chang Deborah R. Hart Daphne Munroe Enrique Curchitser

The original and GAMM RK bias-corrected ROMS daily bottom temperature and salinity from 1980 to 2015 in the Mid-Atlantic Bight (latitude: 35-41.5 N; longitude: 70-76 W; depth: 10-160m).

Header:YearMonthDateLat: LatitudeLon: LongitudeDepth: Depth in meterTempPred: Original ROMS bottom temperature predictionSalPred: Original ROMS bottom salinity predictionBiasCorrectedTempPred: GAMM OK bias-corrected ROMS bottom temperature predictionBiasCorrectedSalPred: GAMM OK bias-corrected ROMS bottom salinity prediction

10.6084/m9.figshare.14245796.v1

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Citations (0)

Timing of the reproductive cycle of waved whelk, Buccinum undatum, on the U.S. Mid-Atlantic Bight

Helgoland Marine Research (2020)

Sarah Borsetti Daphne Munroe David B. Rudders Jui‐Han Chang

Abstract Development of the unmanaged waved whelk ( Buccinum undatum ) fishery on the Mid-Atlantic continental shelf of the United States has initiated investigation into fisheries-related biological and population attributes of the species in this region. Maturation and reproduction timing vary by location for this species and are likely linked to bottom water temperature. This study examined the seasonal fluctuations in relevant body metrics and gonadosomatic index in relation to bottom temperature to assess the timing of the reproductive cycle of the B. undatum population in the southern-most extent of this species’ range in the Atlantic. To characterize variation over the maturation schedule, nine locations in the Mid-Atlantic Bight (MAB) were sampled five times between January 2017 and September 2017. Maturity was assessed macroscopically, with morphological methods, and via gonadosomatic indices. Male behavioral maturity estimates, based on a penis length to shell length index (PL 50 ), were compared to estimates made using other methods for assessing maturity to test the efficacy of this commonly used ratio. Mature whelk were found in all months and peak reproductive activity was observed in spring and early summer. This timing suggests that ideal sampling to visually identify maturity to estimate size of maturity would be late winter or early spring. Unique oceanographic dynamics in the MAB, such as strong seasonal stratification results in large changes in annual bottom temperature which appears to be closely linked to the reproductive cycle in this region. Our data suggest that B. undatum in the MAB experience spawning and development at ~ 7–8 °C; temperatures warmer than Canadian populations and cooler than some UK conspecifics. To our knowledge, this is the first study to document the annual reproductive cycle of waved whelk in the United States.

Whelk

Gonadosomatic Index

Sexual maturity

Overwintering

10.1186/s10152-020-00537-6

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Estimating Finite Rate of Population Increase for Sharks Based on Vital Parameters

PLoS ONE (2015)

Kwang‐Ming Liu Chien-Pang Chin Chunhui Chen Jui‐Han Chang

The vital parameter data for 62 stocks, covering 38 species, collected from the literature, including parameters of age, growth, and reproduction, were log-transformed and analyzed using multivariate analyses. Three groups were identified and empirical equations were developed for each to describe the relationships between the predicted finite rates of population increase (λ') and the vital parameters, maximum age (Tmax), age at maturity (Tm), annual fecundity (f/Rc)), size at birth (Lb), size at maturity (Lm), and asymptotic length (L∞). Group (1) included species with slow growth rates (0.034 yr-1 < k < 0.103 yr-1) and extended longevity (26 yr < Tmax < 81 yr), e.g., shortfin mako Isurus oxyrinchus, dusky shark Carcharhinus obscurus, etc.; Group (2) included species with fast growth rates (0.103 yr-1 < k < 0.358 yr-1) and short longevity (9 yr < Tmax < 26 yr), e.g., starspotted smoothhound Mustelus manazo, gray smoothhound M. californicus, etc.; Group (3) included late maturing species (Lm/L∞ ≧ 0.75) with moderate longevity (Tmax < 29 yr), e.g., pelagic thresher Alopias pelagicus, sevengill shark Notorynchus cepedianus. The empirical equation for all data pooled was also developed. The λ' values estimated by these empirical equations showed good agreement with those calculated using conventional demographic analysis. The predictability was further validated by an independent data set of three species. The empirical equations developed in this study not only reduce the uncertainties in estimation but also account for the difference in life history among groups. This method therefore provides an efficient and effective approach to the implementation of precautionary shark management measures.

Vital rates

10.1371/journal.pone.0143008

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Citations (29)

Estimating natural mortality for Atlantic Sea scallops (Placopecten magellenicus) using a size-based stock assessment model

Fisheries Research (2022)

Deborah R. Hart Jui‐Han Chang

Stock assessment

Stock (firearms)

Akaike information criterion

10.1016/j.fishres.2022.106423

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Citations (3)

Evaluation of Effectiveness of Fixed‐Station Sampling for Monitoring American Lobster Settlement

North American Journal of Fisheries Management (2015)

Yuanyuan Li Jie Cao Jui‐Han Chang Carl Wilson Yong Chen

Abstract The American lobster Homarus americanus supports one of the most valuable fisheries in the USA. One of the important monitoring programs is for benthically settled lobsters, which closely relates to recruitment. The lobster settlement sampling program follows a fixed‐station design. However, the performance of this design has not been evaluated, and we are unclear if the design can capture the temporal dynamics of settlers, in particular in response to changes in spatial distribution of lobster in the last 2 decades. In this study, we compared the fixed‐station design with a random sampling design for the mid‐coast region of the Gulf of Maine. We developed a generalized additive model (GAM) to quantify the relationship between habitat variables and density of early benthic phase and older juvenile lobsters by using the data from inshore trawl surveys from 1989 to 2012. The GAM model was then used to simulate putative true populations using the habitat variables. The two different sampling designs were applied to sample the simulated true populations. The fixed‐station sampling design tended to underestimate the true density but could capture the temporal trends in settler density. A persistence index analysis suggests that the fixed‐station design could identify interannual change of the lobster settler density. This study suggests that fixed‐station sampling design is effective in monitoring temporal changes in settler density but could not be used for the estimation of absolute density of settlers. Received December 16, 2014; accepted July 9, 2015

American lobster

10.1080/02755947.2015.1074961

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Citations (36)