Fisheries Oceanography最新文献

The journal Fisheries Oceanography provides a global forum for fisheries scientists and oceanographers to understand how marine ecosystems, and the services they provide to society, are structured and shaped by environmental variability and climate change. With this special issue, as well as the 30th Anniversary Virtual Issue of the most influential papers from the journal's history, we commemorate 30 years of publishing leading research in the field of fisheries oceanography. These issues showcase the extent, depth and impact of the research published in Fisheries Oceanography. We also reflect on the evolution of research themes through the journal's history, and highlight key emergent themes in our field. We look forward to continuing to publish impactful research in the pages of Fisheries Oceanography in the years ahead.

Recruitment is a critical component of population dynamics and variability in recruitment underpins large fluctuations in population abundances of commercially valuable marine fishes. Marine pelagic fishes such as Atlantic herring (Clupea harengus) experience relatively high variability in recruitment that is driven by a wide range of biotic and abiotic factors. The relative importance and interaction of each factor for determining recruitment is poorly understood, and consequently, recruitment estimates are one of the largest uncertainties in fisheries management and predictions of future population sizes. Poor recruitment of Atlantic herring has been identified as a major issue and bottleneck for the species; therefore, factors influencing successful recruitment are of great interest to fisheries managers. Here we review studies that have examined the factors influencing survival at the egg stage, early larval stage, late larval stage, and juvenile stage to develop a more comprehensive understanding of the recruitment of Atlantic herring and provide recommendations to guide future research. We identified nine biotic and eight abiotic factors that have been found to substantially impact the recruitment of Atlantic herring, with temperature, prey availability, and predation being the most commonly investigated factors. We conclude it is not one factor that primarily determines recruitment, but rather a collection of many factors that vary temporally and spatially that drive the large variation observed in Atlantic herring recruitment year over year. A holistic approach is required to better understand recruitment and improve fisheries management decisions regarding Atlantic herring.

Pelagic fish species, such as tunas, represent important resources for the fishing fleets of several countries. Identifying spatiotemporal distributions of abundance, structure of sizes, weights and influences of environmental variables is extremely important to promote sustainable catches and efficient management plans for fisheries stocks. This present study aimed to analyse the spatiotemporal distribution of Thunnus albacares, their relationships with oceanographic variables, as well as size and weight structure, and the proportions of life stages/phases in catches, mainly within the Brazilian Exclusive Economic Zone. Data were obtained on longline fleet catches; the sea surface temperature (SST) and chlorophyll-a (Chla) were measured in an area ranging from 42.2° to 24.8° W and 5.9° S to 8.8° N; the lunar cycle was also studied. Generalised Additive Models and spatial statistics techniques were used to model the effect of the variables on catch per unit effort (CPUE) and on length structure. The results indicate that the distribution, abundance and length structure of T. albacares are strongly associated with environmental (SST and Chla), temporal (year, months, seasons and moon phases) and spatial (latitude, longitude and hemisphere) variables. The comparison of catch sizes with the first length at maturity (L₅₀) indicated that approximately half of the catches are on young specimens, showing great variation over the years, reaching 74.8% in 2012. These results show that providences should be taken focusing on mitigating young specimens' capture and the sustainable exploitation of tuna in the Atlantic. The patterns of CPUE and length strongly support the feeding and spawning migration hypotheses.

Recruitment of Japanese jack mackerel (Trachurus japonicus) has been decreasing continuously since 2000 in the Pacific coastal waters of Japan. The reasons and mechanisms for this phenomenon are still unclear. Particle-tracking experiments were performed using a data assimilation model to elucidate the effect of a current system on the transportation processes of T. japonicus from the main spawning ground in the southern East China Sea to the Pacific coastal waters. The experiments demonstrated that T. japonicus were transported from the southern East China Sea to the Pacific waters around western Japan through the Tokara Strait, and the number of particles transported to the Pacific decreased from 2000 to 2017. The particles passing through the northwest Tokara Strait tended to be transported to the Pacific side during 2000–2005 and to the Sea of Japan during 2006–2017. The bifurcation toward the Sea of Japan was due to an amplification of the northward current where the Tsushima Warm Current originates (west of Kyushu). This change was induced by a rising sea level west of Kyushu due to Kuroshio's northward shift along the western Pacific coast of Japan, which induced the Tsushima Strait through flow to strengthen. The decrease in larval transportation due to the current system change can be one of the causes for the recruitment decline of T. japonicus along the Pacific coast.

In the last 20 years, the southeastern Bering Sea has shifted its thermal variability to longer-term (4–6 years) ocean–ecosystem temperature stanzas. Age-0 walleye pollock (Gadus chalcogrammus) populations respond to thermal changes with horizontal (east–west) shifts in spatial distribution over the continental shelf, though there are limited data on whether thermally mediated vertical shifts in distribution also occur. Vertical shifts may impact predator–prey overlap between age-0 pollock and their lipid-rich prey, calanoid copepods and euphausiids, resulting in different feeding conditions that ultimately affect fish body condition prior to winter onset. For this study, we analyzed acoustic backscatter measured during acoustic trawl surveys over the southeastern Bering Sea shelf in cold years (2011, 2012) and warm years (2014 and 2016) to determine the vertical distribution of age-0 pollock. This study presents evidence that age-0 pollock changes in vertical distribution were related to changes in ocean annual temperature. Age-0 pollock went from occurring deeper in the water column during cold periods to being surface-oriented during warm periods, potentially exacerbating spatial mismatches between pollock and prey. We relate patterns in a vertical position to physical water column properties, feeding, and bioenergetic condition of collected pollock and discuss implications for recruitment success during different thermal oceanographic stanzas.

The North Pacific armorhead (NPA), Pentaceros wheeleri, is thought to exhibit an extended post-spawning epipelagic phase in which larvae disperse to the northeast Pacific Ocean. Current understanding of juvenile distribution, development, and mechanisms that drive recruitment variation, however, remains largely incomplete. The objective of this study was to compare a time series of NPA recruitment to established climate indices and to environmental covariates to explore drivers of the NPA life cycle. Additionally, this work investigates potential larval NPA transport pathways and their positional relationships to the proposed northeastern nursery grounds. Using Lagrangian particle tracking, trajectories of passive larvae were simulated at depths of 0 and 15 m for 18 years (2001–2018) from the Southern Emperor-Northern Hawaiian Ridge (SE-NHR) natal habitat. Dispersal distances and particle end positions were examined for their potential relationships with recruitment. Sea surface temperature and net primary productivity were evaluated as predictor variables using generalized additive modeling. Neither regression of particle end-point characteristics nor environmental covariates resulted in significant correlations with recruitment here, perhaps owing to data limitations surrounding the nursery zone. Particles were found to be advected largely within the North Pacific transition zone in the central north Pacific. Significant seasonal correlations were found between recruitment and the Arctic Oscillation, Pacific Decadal Oscillation and North Pacific Gyre Oscillation, suggesting that NPA recruitment mechanisms respond to interannual ocean-atmospheric climate oscillations. Better knowledge of the connections between recruitment and the environment would be valuable for stock management, and improvements for advection predictions are discussed.

One of the world's pre-eminent marine scientists and the founding editor of Fisheries Oceanography, Professor Timothy (Tim) R. Parsons, passed away peacefully in hospital in April 2022. He was passionate about building a holistic understanding of how pelagic organisms are interconnected in the food-webs of the sea, and about presenting alternative methods for the management of fisheries. For these activities and many others, he was the recipient of many international awards and honours. He had a profound influence on many students and colleagues, and leaves behind a foundational body of work on fisheries oceanography.

I would like to express my sincere congratulations on the 30th anniversary of the founding of Fisheries Oceanography.

At that time, Professor T. R. Parsons of the University of British Columbia, Canada, and Professor Takashige Sugimoto of the Ocean Research Institute of the University of Tokyo led the preparations for the establishment of an international academic journal “Fisheries Oceanography (FOG)” with the aim of deepening the discipline of fisheries oceanography on a global scale. The Japanese Society of Fisheries Oceanography (JSFO) defines the main research areas of fisheries oceanography as (1) oceanographic conditions that define the distribution of fishery-useful species, (2) oceanographic tools for estimating the abundance of target species and the productivity of fishing grounds, (3) oceanographic conditions for predicting changes in distribution and abundance, and (4) oceanographic contributions to the enhancement and development of fishery productivity. There were growing expectations for the establishment of an international academic journal that would meet these requirements. Prior to the journal establishment, JSFO held the 30th Anniversary Symposium “Promising Fisheries Oceanography in Japan” in Japan in 1991, and in 1986, the 25th Anniversary Symposium “Fisheries and Fisheries Oceanography in the Coming Century” was held in Tokyo, inviting Dr. D. H. Cushing (UK) and Dr. R. Lasker (USA) as keynote speakers. These symposia gave the momentum to publish the journal with an association in Japan. In the end, FOG was first published by Blackwell Scientific Publications (UK) in 1992 with JSFO as the sponsoring association. Now published by John Wiley & Sons, FOG has been the international journal of the JSFO since 2001.

At that time, I had just started my research career and I remember that I had been supporting Professor Sugimoto in his efforts to encourage more important and cutting-edge papers to be submitted to the journal and to develop it into a high-level international academic journal. On this occasion of the 30th anniversary of FOG, it is with great emotion that I address you as the President of JSFO.

Researchers in fisheries oceanography are expected to develop research related to both fisheries and the ocean that is closely linked to the field of fishing, and FOG has the scent of fish and the scent of the ocean. FOG is a unique international academic journal, and it can be said to be an international academic journal that was inspired by Professor Michitaka Uda, the first president of the JSFO. The FOG not only strives for the exploration of fisheries oceanography as a basic science but has also made a great contribution to the development of fisheries oceanography by producing many talented human resources to educational/research institutions, government agencies, and industry. Many Japanese fisheries oceanographers have contributed to

The spawning of Pacific oysters is an important phenomenon for aquaculture because the Japanese oyster culture industry has traditionally utilized natural seed collection from sea areas. The relationship between spawning and environmental factors was investigated on the spawning dates, which were estimated from larval occurrence based on the temperature-dependent growth rate from 2012 to 2020 in Matsushima Bay, a key area for oyster seedling production located in eastern Japan. The annual minimum temperature tended to increase and occur earlier during the 9 years, suggesting warming in the bay. The integrated temperature reaching 600°C, which is as an index for the onset of spawning, was limited to 9 days from late June to early July, and exhibited no trends. Larval abundance at each spawning had a significant relationship with the change of sunshine hours from the previous day, the daily mean seawater temperature, and the maximum tidal range. With relatively extreme environmental factors, mass spawning between neap and half tides was more frequent than one during other tides. A significant relationship was found between precipitation during the rainy season and the mass spawning dates. An empirical method of predicting a mass spawning date was proposed using the relationship to precipitation during the rainy season to ensure efficient seedlings and a constant nationwide supply of Pacific oysters for the aquaculture industry.