Abstract The correct prediction of the shape and strength density dependence in productivity is key to predicting future stock development providing best possible long‐term fisheries management advice. Here, we identify unbiased estimators relationship between somatic growth, recruitment density, apply these 80 stocks Northeast Atlantic. analyses revealed density‐dependent 68% stocks. Excluding pelagic exhibiting significant trends spawning biomass, probability was even higher at 78%....

Starvation is a ubiquitous process in nature as all animals depend on finite resources to survive. Limited food can lead starvation-induced mortality and, depending the scale of limitation, population-level consequences may emerge. However, attempts model are rare it difficult isolate effects specific sources natural mortality. Using commonly collected data body condition, we develop statistical approach index by estimating proportion individuals experiencing severe emaciation fish...

Climate change affects the somatic growth of many important fish species targeted by fisheries worldwide, yet explicit incorporation climate-driven temporal variation in assessment remains limited for most stocks. In this study, we use Eastern Atlantic skipjack ( Katsuwonus pelamis ) as a case study to explore effects misspecifying driven sea surface temperature on stock assessments, highlighting potential risks associated with neglecting under both historical and future climate conditions....

Effective fisheries management is the key to achieve sustainable globally, while accurate monitoring of fishing vessels essential improve effectiveness measures. Self-reported information on vessel types often limited and may not cover all operating vessels, causing incomplete in management. Therefore, a novel way objectively identify large quantity needed. In this study, we presented an innovative integrated deep learning model by using automatic identification system (AIS) data classify...

Fish biomass is the most widely used indicator of fish stock health. Stocks whose or has previously collapsed owing to overfishing, and management systems built around them, may carry a memory decline, even if recovered. This because as main health does not represent all aspects can possibly become weaker after collapse. These latent weaknesses have been termed “ghosts overfishing past”. Not accounting for ghosts impact speed recovery susceptibility further collapses. concept popularised by...

Oceanic temperature fluctuations are one of the leading factors affecting marine fish populations. Indian Ocean Dipole (IOD), characterized as sea surface (SST) anomaly change, is an ocean–atmosphere interactive process causing interannual climate variability in Ocean. Influences IOD on tuna catch rates supported by previous research. Yet, there remains limited information about impacts abundance stocks. In this study, we used standardized Catch Per Unit Effort (CPUE) index to present stock...

Monitoring and understanding the behavior of fishing vessels are important in facilitating effective management, preventing illegal fishing, informing grounds evaluating effects harvests on fishery resources. In recent decades, a large quantity real-time data have become available with development vessel-tracking systems, making it possible to study high spatial temporal resolutions. To effectively efficiently deal amount data, algorithms from artificial intelligence (AI) increasingly...

The relative effects of biotic and abiotic factors, the life-history stages upon which they act to affect fish recruitment, vary among species ecosystems. We compared spawning stock biomass, factors operating at early-term (encompassing egg, yolk-sac larval, first few days swim-up larval stages), middle-term (including pelagic juvenile late-term (over benthic stage) on recruitment by yellow perch (Perca flavescens) in western basin Lake Erie between 1999 2013. Variation was mainly driven...

Abstract Fish stock–recruitment relationships (SRRs) may vary in response to ecosystem change, increasing uncertainty for fisheries management. We defined three periods between 1975 and 2015 over which Lake Erie, a Laurentian Great Lake, underwent significant changes: before zebra mussel (Dreissena polymorpha) establishment, after establishment re-eutrophication, re-eutrophication. To examine the extent SRRs of Erie yellow perch (Perca flavescens) also varied these periods, we compared...

The current functional scale design of storage furniture which the elderly use does not meet their needs, and unsuitable may bring many physiological psychological problems to daily lives. purpose this study is start with hanging operation, factors influencing operation heights people undergoing self-care in a standing posture determine research methods be used appropriate height so as provide data theoretical support for suitable elderly. This quantifies situations people's through an sEMG...

Abstract Despite continued calls for the application of ecosystem‐based fisheries management, tactical management continues to be heavily reliant on single‐species stock assessments. These assessments rarely quantitatively integrate effects ecosystem processes fish productivity. This lack integration is ultimately driven by complexity interactions between populations, ecosystems and fisheries, which produces uncertainty when defining include how them. Models developed using a structured...

Older spawning fish were often observed to contribute more recruits harvested stocks than younger fish. However, effects of stock age structure on recruitment not universally detected. We tested age-dependent absolute fecundity, relative and age-related maternal by Lake Erie yellow perch (Perca flavescens). No fecundity nor positive effects, detected at multidecadal or finer temporal scales analysis, between 1975 2013. Instead, we found evidence negative spatially temporally varying...

A fishery-independent survey can provide detailed information for fishery assessment and management. However, the sampling design on ichthyoplankton in estuary area is still poorly understood. In this study, we developed six stratified schemes with various sample sizes, attempting to find cost-efficient designs monitoring Coilia mystus Yangtze Estuary. The generalized additive model (GAM) Tweedie distribution was used quantify “true” of C. eggs larvae, based data from 2019–2020. performances...

Fisheries involve complex problems not easily addressed by a single discipline, methodology, or set of stakeholders. In 2010, the Canadian Research Network (CFRN) was initiated to increase fisheries research capacity in Canada through interdisciplinary and inclusive collaborations. As post-graduate students network, we reflected on type training necessary tackle reviewed opportunities available at universities receive such training. This paper presents an overview education currently Canada,...

Abstract Environmental change and anthropogenic activity, alone or in combination, may cause vital rates of fish populations to exhibit low‐frequency, large‐magnitude variation leading non‐stationary population processes inherently dynamic ecosystems. It remains unclear why, when and, so, whether, should be taken into account fisheries stock assessment models. Here, we clarify the necessity conditions for including Specifically, convention treating with constant parameters might unreliable...

Anomalous local temperature and extreme events (e.g. heat-waves) can cause rapid change gradual recovery of environmental conditions. However, few studies have tested whether species distribution recover following returning Here, we for the spatial distributions two flatfish populations, American plaice (Hippoglossoides platessoides) yellowtail flounder (Limanda ferruginea), in response to consecutive decreasing increasing water on Grand Bank off Newfoundland, Canada from 1985 2018. Using a...

Juvenile mortality is an important factor affecting the spatiotemporal dynamics of fish recruitment, but estimation variations in juvenile rates remains challenging. We developed a state-space metapopulation model to simultaneously estimate and cohort strength applied this general modelling framework data from multiple surveys for (ages 2–5) Atlantic cod (Gadus morhua) stocks off Newfoundland Labrador (NL). found large-scale synchronized decreasing increasing offshore eastern southeastern...

Asbtract Stock–recruitment relationships (SRRs) may vary over time due to ecological and anthropogenic impacts, challenging traditional approaches of calculating maximum sustainable yield (MSY)-based reference points that assume constant population traits. We compare seven methods calculate MSY, FMSY BMSY by modelling constant, stochastic (uncorrelated), autocorrelated SRRs using simulations two case studies [Atlantic cod (Gadus morhua) American plaice (Hippoglossoides platessoides) on the...

Fishery stock assessment requires accurate specification of the growth function target species, and aging uncertainty is an important factor that affects estimation parameters. In this study, we used simulations to study effects two types uncertainty, error sampled age range, on parameter Von Bertalanffy function, including asymptotic length (L∞), coefficient (k), theoretical in year at zero (t0) five tuna species. We found estimated curves increased with increasing errors. When errors were...

Abstract It is challenging in fisheries stock assessment to estimate cohort dynamics from length‐based data for hard‐to‐age stocks, and existing approaches, example, age‐structured catch‐at‐length models (ACL) are unable account length‐dependent processes within each cohort. Fisheries‐dependent usually considered the default input models. However, with widespread recognition of uncertainty fisheries‐dependent increasing availability high‐quality survey data, a new situation emerges some...

Abstract Forage fish species are key in the transfer of energy from lower to upper trophic levels marine ecosystems. Therefore, understanding their population dynamics, including levels, is crucial for productivity and regulation food webs. However, many forage fishes poorly sampled by bottom trawl surveys, leading poor estimates abundance. These can be improved using predator stomach contents as an additional sampling strategy; however, nonlinear relationships between prey abundance...