Quang C. Huynh

Quang C. Huynh
Blue Matter Science Ltd

Doctor of Philosophy

About

13
Publications
3,654
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57
Citations

Publications

Publications (13)
Technical Report
Full-text available
Under Canadian policy and legislation, fish stocks that have been assessed as being below the Limit Reference Point (LRP) require a rebuilding plan to grow the stock above the LRP. Re- building plans should be based upon objectives characterised by (1) a target, (2) a desired time to reach the target, and (3) an acceptable probability of reaching th...
Article
A retrospective pattern within a stock assessment occurs when historical estimates systematically increase or decrease as data are removed and has been cited as a cause of persistent overfishing. For two case studies, Gulf of Maine cod and New England pollock, we demonstrated how closed-loop simulation can be used to evaluate the impacts of retrosp...
Technical Report
Full-text available
The Pacific Region Groundfish Integrated Fisheries Management Plan lists approximately 80 species-area fish stocks for which annual total allowable catches are required, most of which are applied as individual transferable quotas within the British Columbia (BC) integrated groundfish fishery. The majority of fish stocks encountered by the integrate...
Technical Report
Full-text available
Context: The Pacific Region Groundfish Integrated Fisheries Management Plan lists approximately 80 species-area fish stocks for which annual total allowable catches are required. Most of these allowable catches are applied as individual transferable quotas within British Columbia (BC) groundfish fisheries. The majority of stocks encountered by the...
Technical Report
Full-text available
SUMMARY • The inside stock of Yelloweye Rockfish (Sebastes ruberrimus, Inside Yelloweye Rockfish) is a data-limited stock, occurring in Groundfish Management Area 4B (Queen Charlotte Strait, Strait of Georgia, and Strait of Juan de Fuca) in British Columbia (BC). • The stock was assessed as being below the Limit Reference Point (LRP) in 2010, resu...
Article
Stock assessments are often used to provide management advice, such as a total allowable catch (TAC), to fishery managers. Many stocks are not assessed annually, and the TAC from the previous assessment is often maintained in years between assessments. We developed two interim management procedures (MPs) that update the estimate of current vulnerab...
Article
Length-based mortality estimators have been developed as alternative assessment methods for data-limited stocks. We compared mortality estimates from three methodologically related mean length-based methods to those from an age-structured model (ASM). We estimated fishing mortality and determined overfishing status, i.e. if F/FMSY > 1, for six stoc...
Article
Full-text available
Common uncertainties in stock assessment relate to parameters or assumptions that strongly determine both the estimates of quantities of management interest (e.g. stock depletion) and related reference points (e.g. biomass at maximum sustainable yield). The risks associated with these uncertainties are often presented to managers in the form of dec...
Article
Full-text available
Length‐based methods provide alternatives for estimating the instantaneous total mortality rate (Z) in exploited marine populations when data are not available for age‐based methods. We compared the performance of three equilibrium length‐based methods: the length‐converted catch curve (LCCC), the Beverton–Holt equation (BHE), and the length‐based...
Article
Full-text available
Gedamke and Hoenig (2006) (Transactions of the American Fisheries Society, 135: 476-487) developed a non-equilibrium version of the Beverton and Holt estimator of total mortality rate, Z, based on mean length and thereby increased the usefulness of length-based methods. In this study, we extend their model by replacing period-specific Z parameters...
Article
Full-text available
A series of estimates of the total mortality rate (Z) can be obtained by using the Beverton–Holt nonequilibrium-based approach of Gedamke and Hoenig (2006) on observations of population mean length over time (ML model). In contrast, only relative mortality rates (not absolute values) can be obtained from a time series of catch rates. We derived the...
Article
Full-text available
Recent advances in methodology allow the history of the total mortality rate experienced by a population to be estimated from periodic (e.g., annual) observations on the mean length of the population. This approach is generalized to allow data on several species that are caught together to be analyzed simultaneously based on the theory that changes...
Conference Paper
Full-text available
Many fishery stock assessments rely on accurate estimates of age composition. For a given year, the age composition of a population can be calculated using age-length keys; the length distribution of the population is converted to an age distribution using age-at-length estimates from a sub-sampled population. This method requires annual estimates...

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