Shijie Zhou

Shijie Zhou
The Commonwealth Scientific and Industrial Research Organisation | CSIRO · Oceans and Atmosphere

PhD

About

117
Publications
33,715
Reads
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3,454
Citations
Citations since 2016
30 Research Items
1889 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300

Publications

Publications (117)
Article
The world's seas and oceans are a vital source of animal protein from fishing and a major contributor to global food security. It has been argued that global wild-catch production has reached its limit, and there is concern that many species are overfished. Concerns are also mounting about the state of marine ecosystems and the ecological impacts o...
Article
Full-text available
The rule of thumb that fishing mortality to achieve maximum sustainable yield (FMSY) equals natural mortality (M) has been both criticised and supported by theoretical arguments. However, the relationship has been rarely investigated using empirical data. We carried out a meta-analysis on 245 fish species worldwide and linked three types of referen...
Article
By-catch and (or) discards in fisheries have been considered a serious problem and have been unanimously criticized by politicians, environmental groups, the public and scientists. However, it is possible to determine biologically acceptable amounts of discards that fulfil the objectives of ecosystem-based fishery management (EBFM). For instance, w...
Article
Full-text available
Globally, many fish species are overexploited, and many stocks have collapsed. This crisis, along with increasing concerns over flow-on effects on ecosystems, has caused a reevaluation of traditional fisheries management practices, and a new ecosystem-based fisheries management (EBFM) paradigm has emerged. As part of this approach, selective fishin...
Article
Using length frequency distribution data (LFD) is cost-effective for estimating somatic growth in fish or invertebrates as length data are relatively easy to obtain. The recently developed R packages TropFishR and fishboot extend classic ELEFAN (Electronic LEngth Frequency ANalysis) programs and include more powerful optimization procedures and a b...
Article
The Northern Prawn Fishery (NPF) is one of Australia’s most valuable federally managed fisheries. It has also been a focus for modelling in Australia, with over 40 years of development of bioeconomic, stock assessment and management strategy evaluation models that have been used to varying degrees to inform management. The current management model...
Article
Sharks (class Chondrichthyes, subclass Elasmobranchii) typically have a long lifespan, slow growth rate and low fecundity, leading to low productivity and hence relatively high vulnerability to fishing. Information for managing fisheries catches of elasmobranchs is often lacking, because elasmobranchs are usually non‐target species, often with low...
Article
Full-text available
Due to persistent fishing expansion in the China Seas over the past six decades, fisheries resources have been over-exploited; as a result, exploited fish have become smaller in size and younger in age. Marine piscivorous fish constituted a large portion of Chinese fisheries catch, long-term variability of which has rarely been investigated despite...
Method
Full-text available
10.1093/icesjms/fsx226
Article
Empirical studies are popular in estimating fish natural mortality rate (M). However, these empirical methods derive M from other life-history parameters and are often perceived as being less reliable than direct methods. To improve the predictive performance and reliability of empirical methods, we develop ensemble learning models, including baggi...
Article
Analysis of spawning biomass per‐recruit has been widely adopted in fisheries management. Fishing mortality expressed as spawning potential ratio (SPR) often requires a reference point as an appropriate proxy for the fishing mortality that supports a maximum sustainable yield—FMSY. To date, a single generic level between F30% and F40% is routinely...
Article
Estimating fish growth from length frequency data is challenging. There is often a lack of clearly separated modes and modal progression in the length samples due to a combination of factors, including gear selectivity, slowing growth with increasing age, and spatial segregation of different year classes. In this study, we present an innovative Bay...
Article
Full-text available
Balanced harvest has been proposed to reduce fishing impact on ecosystems while simultaneously maintaining or even increasing fishery yield. The concept has attracted broad interest, but also received criticisms. In this paper, we examine the theory, modelling studies, empirical evidence, the legal and policy frameworks, and management implications...
Article
Full-text available
Fish and seafood consumption in Australia has been growing, yet the implications of this trend across the food system, from both a health and sustainability perspective have not been fully explored. This paper aims to map out the fish and seafood food system in Australia, linking production and consumption, to articulate challenges and opportunitie...
Article
The majority of catch per unit effort (cpue) standardizations use generalized linear models (GLMs) or generalized additive models (GAMs). We develop geostatistical models that model catch locations as continuous Gaussian random fields (GRFs) and apply them to standardizing cpue in Australia’s Eastern Tuna and Billfish Fishery (ETBF). The results ar...
Article
Full-text available
To assess fishing effects on data-poor species, impact can be derived from spatial overlap between species distribution and fishing effort and gear catchability. Here, we enhance the existing sustainability assessment for fishing effect method by estimating gear efficiency and heterogeneous density from sporadic catch data. We apply the method to t...
Article
Discarding is a worldwide problem in small-scale and industrial fisheries alike. A significant proportion of discarded fish are edible, and if high post-release mortality occurs, the practice may seem wasteful in the context of food security. There are different reasons for discarding which can be related to demand-side issues (e.g. market preferen...
Method
Full-text available
BRT model using 8 predictors. See references: 1. Zhou, S., Punt, A.E., Smith, A.D.M., Ye, Y., Haddon, M., Dichmont, C.M., Smith, D.C., 2018. An optimised catch-only assessment method for data poor fisheries. ICES Journal of Marine Science 75(3): 964-976. doi:10.1093/icesjms/fsx226 2. Zhou, S., Punt, A.E., Ye, Y., Ellis, N., Dichmont, C.M., Haddon,...
Method
Full-text available
BRT model using 38 predictors. See references: 1. Zhou, S., Punt, A.E., Smith, A.D.M., Ye, Y., Haddon, M., Dichmont, C.M., Smith, D.C., 2018. An optimised catch-only assessment method for data poor fisheries. ICES Journal of Marine Science 75(3): 964-976. doi:10.1093/icesjms/fsx226 2. Zhou, S., Punt, A.E., Ye, Y., Ellis, N., Dichmont, C.M., Haddon...
Preprint
Catch statistics are perhaps the most commonly collected data and are widely available for many fisheries. However, it is currently difficult to provide scientific advice for management purposes using only catch data. This article presents a catch-only method for stock assessment of data-poor fisheries. It uses time series of catches and two priors...
Preprint
Fishing intensity and selectivity patterns affect ecosystem structure and fisheries yield, the 2 fundamental performance measures in the ecosystem approach to fisheries. We used a simple multispecies predation model to explore the effect of alternative fishing strategies on a 3‑trophic-level food chain. Fishing strategies included highly selective...
Technical Report
Full-text available
Within the framework of the Commonwealth Harvest Strategy Policy, the Australian Fisheries Management Authority (AFMA) has adopted clear decision rules to set catch limits for commercially targeted species in Commonwealth fisheries. In several fisheries, AFMA has adopted a tiered harvest strategy framework that specifies both assessment methods and...
Article
Fishing intensity and selectivity patterns affect ecosystem structure and fisheries yield, the 2 fundamental performance measures in the ecosystem approach to fisheries. We used a simple multispecies predation model to explore the effect of alternative fishing strategies on a 3-trophic-level food chain. Fishing strategies included highly selective...
Article
Catch statistics are perhaps the most commonly collected data and are widely available for many fisheries. However, it is currently difficult to provide scientific advice for management purposes using only catch data. This article presents a catch-only method for stock assessment of data-poor fisheries. It uses time series of catches and two priors...
Technical Report
Full-text available
This project was undertaken by a collaboration of senior fishery scientists at CSIRO and from New Zealand, together with a former fisheries manager now with the Commonwealth Department of Agriculture and Water Resources in Canberra, on the development of methods to construct indices of stock abundance trends from commercial catch-per-unit-effort (C...
Article
The degree to which a stock is depleted is one of the most important quantities in fisheries management because it is used to quantify the success of management and to inform management responses. However, stock depletion is extremely difficult to estimate, particularly with limited data. Using the RAM Legacy database, we developed a boosted regres...
Article
Two tools to assess impacts of fisheries on fish species have been developed for use as part of the Ecological Risk Assessment for the Effects of Fishing (ERAEF) toolbox, namely, the Productivity and Susceptibility Analysis (PSA) and the Sustainability Assessment for Fishing Effect (SAFE). Both have been applied to major Australian Commonwealth fis...
Article
Full-text available
Since “balanced harvest” was proposed in 2010 as a possible tool in the operationalization of the ecosystem approach to fisheries (EAF), the concept gained extensive international attention. Because maintaining ecosystem structure and achieving maximum sustainable yields have become two of the key international legal obligations in fisheries manage...
Article
Full-text available
It is common to model the dynamics of fisheries using natural and fishing mortality rates estimated independently using two separate analyses. Fishing mortality is routinely estimated from widely available logbook data, whereas natural mortality estimations have often required more specific, less frequently available, data. However, in the case of...
Technical Report
Full-text available
The concept of the Ecosystem Approach has entered the fishery harvesting discussions both from fishery perspectives (Reykjavik Declaration; FAO 2003 Annex to the Code of Conduct and from the principles of the Ecosystem Approach adopted by the CBD in 1995. Both perspectives establish the need to maintain ecosystem structure and functioning, whether...
Article
Full-text available
The delay difference model was implemented to fit 21 years of brown tiger prawn (Penaeus esculentus) catch in Moreton Bay by maximum likelihood to assess the status of this stock. Monte Carlo simulations testing of the stock assessment software coded in C++ showed that the model could estimate simultaneously natural mortality in addition to catchab...
Article
Full-text available
Tropical sea cucumbers are commonly exploited by small-scale, poorly managed fisheries. A fundamental problem in managing sea cucumber fisheries is the lack of basic knowledge of important life history characteristics for most species. As a result of plastic body dimensions, biological research on this group of animals becomes exceptionally challen...
Technical Report
Full-text available
Durante los últimos 20 años, el IFOP ha asesorado a la Subsecretaría de Pesca y Acuicultura en la determinación del estado de los stocks y de las Capturas Biológicamente Aceptables (CBA) de las principales pesquerías chilenas. Para esto IFOP ha empleado diferentes Puntos Biológicos de Referencia (PBR) conforme ha ido evolucionando la ciencia pesque...
Article
Full-text available
Modelling multiple fishing gear efficiencies and abundance for aggregated populations using fishery or survey data. – ICES Journal of Marine Science, doi: 10.1093/icesjms/fsu068. Fish and wildlife often exhibit an aggregated distribution pattern, whereas local abundance changes constantly due to movement. Estimating popu-lation density or size and...
Technical Report
Full-text available
An exploited population of a fish species may be subjected to fishing mortality from multiple fisheries or gear types. Previous ecological risk assessment methods assess stressors separately on a fishery by fishery basis. By contrast, it is the cumulative impact from all fisheries and gears on each individual species that determines the species’ ov...
Book
Full-text available
http://frdc.com.au/research/Documents/Final_reports/2010-044-DLD.pdf The implementation of the Commonwealth Harvest Strategy Policy requires limit and target reference points for each fishery. These reference points can be both biomass-based (e.g., BTARG, BMSY, BLIM etc.) and fishing mortality-based (e.g., FTARG, FMSY, FLIM etc.). Estimating these...
Article
Full-text available
Biomass, catchability, and natural mortality are key parameters in fish stock assessment. Yet, it is difficult to estimate these quantities, especially natural mortality, when only fishery data are available. Using a method of population depletion analysis, we estimated these population and biological quantities for the white banana prawn (Penaeus...
Article
Full-text available
Fisheries bycatch threatens populations of marine megafauna such as marine mammals, turtles, seabirds, sharks and rays, but fisheries impacts on non-target populations are often difficult to assess due to factors such as data limitation, poorly defined management objectives and lack of quantitative bycatch reduction targets. Limit reference points...
Article
Summary Many population dynamics models and common software packages, including for capture–mark–recapture, occupancy and catch‐at‐age models, are estimable using parameters that are either constant for all years or vary annually. We develop a spline approximation to time‐varying parameters, which includes the constant or annually varying case as t...
Article
Full-text available
Concern about the impact of fishing on ecosystems and fisheries production is increasing (1, 2). Strategies to reduce these impacts while addressing the growing need for food security (3) include increasing selectivity (1, 2): capturing species, sexes, and sizes in proportions that differ from their occurrence in the ecosystem. Increasing evidence...
Article
Full-text available
Zhou, S., Milton, D. A., and Fry, G. C. 2012. Integrated risk analysis for rare marine species impacted by fishing: sustainability assessment and population trend modelling. – ICES Journal of Marine Science, 69: 271–280. Risk assessment and conservation management of rare species are challenging due to a lack of data. We developed an integrated ris...
Article
Full-text available
Risk assessment and conservation management of rare species are challenging due to a lack of data. We developed an integrated risk assessment approach to assess human impact on population sustainability of rare species. The approach involved two components: a quantitative sustainability assessment coupled with modelling trends in relative abundance...
Article
Assessment of ecological sustainability for all species impacted by fishing is one of the most important and practical steps towards an Ecosystem Approach to Fisheries. We extend methods for Sustainability Assessment for Fishing Effects (SAFE) to assess diverse bycatch species in a multi-sector and multi-gear fishery. We develop methods for estimat...
Conference Paper
Research on overfishing has largely focused on target species. The status and roles of the entire fish community have received little consideration in the debate of overfishing. Fishing by nature is always selective. Among more than 30,000 fish species, only a small proportion is targeted and an even smaller proportion overfished. The classical rec...
Article
Full-text available
Fisheries typically experience large changes over time in fishing effort. The size of the area fished may also change substantially over time, mimicking the trend in fishing effort, and may have major effects on the population dynamics and fishing process. We extend a biomass dynamics model to incorporate fished area and relative fish density in fi...
Article
Full-text available
Catchability and natural mortality are key quantities in fisheries stock assessment. However, it is difficult to estimate these two parameters simultaneously using only fishery catch and effort data. A Bayesian state–space modified delay–difference model is outlined that can estimate time series of catchability by fleet as well as natural mortality...
Book
Full-text available
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Article
Full-text available
We conducted a laboratory experiment to compare effectiveness of two pot designs in reducing the bycatch of female and sublegal-sized male red king crabs (Paralithodes camtschaticus) while retaining legal males. One pot (pot A) was a simulated standard king crab pot; a newly designed pot (pot B) had smaller mesh size, lower and wider entrances, and...
Article
Full-text available
Climate change presents significant challenges to modelling and managing aquatic resources. Equilibrium assumptions common in many modelling approaches need to be replaced by formulations that allow for changing baselines and integration of ongoing changes and adaptations by species, ecosystems and humans. As ecosystems change, so will the ways hum...
Article
Full-text available
The conventional selectivity paradigm is briefly reviewed and its performance examined from an ecosystem perspective. It is stressed that the overall (cumulative) selectivity of the harvest process in an ecosystem is the result of nested selection by fishers and fisheries of: (i) habitats; (ii) species assemblages; (iii) populations and (iv) indivi...
Article
Punt, A. E., Deng, R. A., Dichmont, C. M., Kompas, T., Venables, W. N., Zhou, S., Pascoe, S., Hutton, T., Kenyon, R., van der Velde, T., and Kienzle, M. 2010. Integrating size-structured assessment and bioeconomic management advice in Australia's northern prawn fishery. - ICES Journal of Marine Science, 67: 1785-1801. Three species in Australia's n...
Article
The Australian Northern Prawn Fishery (NPF) is one of the few that has adopted a dynamic version of a ‘maximum economic yield’ (MEY) target, and, on this basis, the fishery is undergoing a process of substantial stock rebuilding. This study details the bioeconomic model used to provide scientific management advice for the NPF, in terms of the amoun...
Article
The seasonal life-history patterns of penaeid prawns are complex and there are distinct differences between species. Better knowledge and understanding of offshore migration to the fishing grounds of penaeid prawns is particularly important for the operation and management of the Northern Prawn Fishery, Australia. Knowledge of the location of prawn...