Reflections on technology and science in fishery research

2017 ◽  
Vol 74 (8) ◽  
pp. 2069-2075 ◽  
Author(s):  
David N. MacLennan
Keyword(s):  
Fishery Management ◽  
Assessment Tool ◽  
Stock Assessment ◽  
Commercial Fishing ◽  
Fishing Gear ◽  
Positive Contribution ◽  
Personal Involvement ◽  
The Past ◽  
Fishery Research ◽  
The 1960S

Abstract In the latter part of the 20th century, fishery research expanded from its original biological base to include new areas, notably investigations of fishing-gear performance and fish-detection by sonar. The past 50 years have seen huge advances in technology and the combination of physical and biological insights in fishery research. Fishing-gear investigations initially focussed on the economics of commercial fishing, but in the 1970s energy consumption in fishing became a major issue. Thereafter, the objectives changed to support for fishery management through gear innovations and research, giving a better understanding of exploitation patterns. During this period, fishery acoustics advanced from crude beginnings in the 1960s to the powerful stock-assessment tool it is today. Progress in these fields has depended on multi-disciplinary research involving both the physical and biological sciences. There have been failures along the way, but there is now good understanding of how technology as well as science can make a positive contribution to fishery management. This essay describes these developments as seen from my personal involvement over the past half century. It concludes with some pointers to the future, and practical advice to young researchers considering a career in fishery research.

scholarly journals Discard mortality rates in the Bering Sea snow crab, Chionoecetes opilio, fishery

2015 ◽  
Vol 72 (5) ◽  
pp. 1525-1529 ◽  
Author(s):  
J. Daniel Urban
Keyword(s):  
Mortality Rate ◽  
Bering Sea ◽  
Fishery Management ◽  
Stock Assessment ◽  
Mortality Rates ◽  
Snow Crab ◽  
Commercial Fishing ◽  
Chionoecetes Opilio ◽  
Discard Mortality ◽  
The Bering Sea

Abstract Fish and invertebrates that are unintentionally captured during commercial fishing operations and then released back into the ocean suffer mortality at unknown rates, introducing uncertainty into the fishery management process. Attempts have been made to quantify discard mortality rates using reflex action mortality predictors or RAMP which use the presence or absence of a suite of reflexes to predict discard mortality. This method was applied to snow crab, Chionoecetes opilio, during the 2010–2012 fisheries in the Bering Sea. Discard mortality in the fishery is currently assumed to be 50% in stock assessment models, but that rate is not based on empirical data and is widely recognized to be in need of refinement. Over 19 000 crab were evaluated using the RAMP method. The estimated discard mortality rate was 4.5% (s.d. = 0.812), significantly below the rate used in stock assessment models. Predicted discard mortality rates from the 2010 to 2012 study were strongly correlated with the air temperature at the St Paul Island airport in the Pribilof Islands. Using this relationship, the discard mortality rate from 1991 to 2011 was estimated at 4.8% (s.d. = 1.08).

scholarly journals Analysis of Optimal Harvest and Management of Capture Fishery of Lake Ziway, Central Ethiopia

2021 ◽  
Author(s):  
Kindineh Sisay
Keyword(s):  
Public Good ◽  
Fish Species ◽  
Fishery Management ◽  
Management Practices ◽  
Stock Assessment ◽  
Free Access ◽  
Fishing Gear ◽  
Total Allowable Catch ◽  
Individual Transferable Quotas ◽  
Near Future

Abstract Even if there is fluctuation in fish species diversity and relative abundance of the species, Lake Ziway provides numerous environmental and/or ecosystem services. Despite to its importance, the Lake faces numerous threats because of its public good characteristics. Following the exponentially increased demand for fishes and the resource being public good, magnificent number of individuals are participated in capture fisheries in order to secure their livelihood. Free access to the fisheries, illegal fishing gears and environmental degradation are among the main reasons of decline in fish species and degradation of the Lake. From the current stock assessment survey, the study showed decline in biomass of fish over time. These negative trends in the Lake Ziway fisheries and poor water quality led to loss of livelihoods of many households who are directly or indirectly dependent on the Lake. Therefore, management of Lake Ziway fishery becomes very essential to manage the resource efficiently in a way that maximize fishers present and future benefits otherwise, the fish resource will disappear in the near future. Concerning management practices, most of the fishery regulations in this Lake put emphasis on the restriction of fishing gear, but the application of this instrument with its restrictions is almost zero. Moreover, Individual Transferable Quotas (ITQs) foster greater transparency and accountability for the management and enhancement of fishery resources by quota owners. In this regard, since it generates a sense of ownership and its versatility in providing a stable and productive market, ITQs are more effective than gear restrictions and in fact, it has major social benefits by controlling overharvesting. Due to this, to ensure the nutritional and food security of the country currently and in the near future, there is a need to enforce fishing gear restriction and set ITQs. Furthermore, there must be strong effort on studying the current stock of fish, and numbers of legal and illegal fishers to set Individual Transferable Quotas (ITQs) and Total Allowable Catch (TAC) for sustainable fishery management of Lake Ziway.

Problems of Analysis of Design and Research Methods of Interaction with the Urban Environment

2020 ◽  
pp. 99-110
Author(s):  
П. В. Капустин ◽  
А. И. Гаврилов
Keyword(s):  
Urban Planning ◽  
Urban Environment ◽  
Urban Studies ◽  
Environmental Movement ◽  
The Past ◽  
Types Of Knowledge ◽  
Historical Dynamics ◽  
The 1960S ◽  
The City ◽  
Research And Design

Состояние проблемы. Проблематика городской среды заявила о себе в 1960-е годы как протест против модернистских методов урбанизма и других видов проектирования. Средовое движение не случайно тогда именовали «антипрофессиональным» - оно было направлено против устоявшихся и недейственных методов работы с городом - от исследования до управления. За прошедшие десятилетия в рамках самого средового движения и его идейных наследников наработано немало методов и приемов работы, однако они до сих не подвергались анализу как пребывающая в исторической динамике целостная совокупность инструментария, альтернативного традиционному градостроительству. Результаты. Рассмотрены особенности и проблемы анализа методологического «арсенала» средового движения и урбанистики. Методы работы с городской средой впервые структурированы по типам знания. Показана близость методов исследовательского и проектного подходов в отношении городской среды. Выводы. В ближайшее время можно ожидать появления новых синтетических знаний и частных методологий, связанных как с обострением средовой проблематики, с расширением круга средовых акторов, так и с процессом профессионализации урбанистики. Statement of the problem. The urban environment paradigm emerged in the 1960s as a protest against the modernist methods of urbanism and other types of design. It was no coincidence that the environmental movement was back then called "anti-professional" as it was directed against the established and ineffective methods of working with the city, i. e., from research to management. Over the past decades, within the framework of the environmental movement and its ideological heirs, a lot of methods and have been developed. However, they have not yet been analyzed as an integral set of tools in the historical dynamics which is an alternative to traditional urban planning. Results. The features and problems of the analysis of the methodological “arsenal” of environmental movement and urban studies are considered. The methods of working with the urban environment are first structured according to the types of knowledge. The proximity of research and design approaches in the case when the urban environment is dealt with is shown. Conclusions. In the nearest future, we can expect new synthetic knowledge and particular methodologies related to both the exacerbation of environmental problems to emerge as well as the expansion of the circle of environmental actors and the process of professionalization of urbanstics.

scholarly journals A new diatom training set for the reconstruction of past water pH in the Tatra Mountain lakes

2021 ◽  
Author(s):  
Elwira Sienkiewicz ◽  
Michał Gąsiorowski ◽  
Ladislav Hamerlík ◽  
Peter Bitušík ◽  
Joanna Stańczak
Keyword(s):  
Surface Sediments ◽  
Tatra Mountains ◽  
Training Set ◽  
Statistical Parameters ◽  
The Past ◽  
Water Ph ◽  
Inferred Ph ◽  
The 1960S ◽  
The Tatra Mountains ◽  
The Relationship

AbstractLakes located in the Polish and Slovak parts of the Tatra Mountains were included in the Tatra diatom database (POL_SLOV training set). The relationship between the diatoms and the water chemistry in the surface sediments of 33 lakes was the basis for the statistical and numerical techniques for quantitative pH reconstruction. The reconstruction of the past water pH was performed using the alpine (AL:PE) and POL_SLOV training sets to compare the reliability of the databases for the Tatra lakes. The results showed that the POL_SLOV training set had better statistical parameters (R2 higher by 0.16, RMSE and max. bias lower by 0.2 and 0.36, respectively) compared to the AL:PE training set. The better performance of the POL_SLOV training set is particularly visible in the case of Przedni Staw Polski where the curve of the inferred water pH shows an opposite trend for the period from the 1960s to 1990 compared to that based on the AL:PE dataset. The reliability of the inferred pH was confirmed by the comparison with current instrumental measurements.

scholarly journals Criminology: Some lines of flight

2021 ◽  
Vol 54 (1) ◽  
pp. 21-33
Author(s):  
Julie Berg ◽  
Clifford Shearing
Keyword(s):  
21St Century ◽  
Energy Systems ◽  
Social Practices ◽  
Smart Phones ◽  
40Th Anniversary ◽  
The Past ◽  
Domain Of Existence ◽  
James Lovelock ◽  
The 1960S ◽  
Space Of Flows

The 40th Anniversary Edition of Taylor, Walton and Young’s New Criminology, published in 2013, opened with these words: ‘The New Criminology was written at a particular time and place, it was a product of 1968 and its aftermath; a world turned upside down’. We are at a similar moment today. Several developments have been, and are turning, our 21st century world upside down. Among the most profound has been the emergence of a new earth, that the ‘Anthropocene’ references, and ‘cyberspace’, a term first used in the 1960s, which James Lovelock has recently termed a ‘Novacene’, a world that includes both human and artificial intelligences. We live today on an earth that is proving to be very different to the Holocene earth, our home for the past 12,000 years. To appreciate the Novacene one need only think of our ‘smart’ phones. This world constitutes a novel domain of existence that Castells has conceived of as a terrain of ‘material arrangements that allow for simultaneity of social practices without territorial contiguity’ – a world of sprawling material infrastructures, that has enabled a ‘space of flows’, through which massive amounts of information travel. Like the Anthropocene, the Novacene has brought with it novel ‘harmscapes’, for example, attacks on energy systems. In this paper, we consider how criminology has responded to these harmscapes brought on by these new worlds. We identify ‘lines of flight’ that are emerging, as these challenges are being met by criminological thinkers who are developing the conceptual trajectories that are shaping 21st century criminologies.

¿¿Nueva narrativa? Entrevista con David Toscana

2002 ◽  
Vol 18 (2) ◽  
pp. 351-362
Author(s):  
Pablo A. J. Brescia ◽  
Scott M. Bennett
Keyword(s):  
Latin American ◽  
The Past ◽  
Current State ◽  
Latin American Narrative ◽  
Boom Latinoamericano ◽  
The 1960S ◽  
Time Frames ◽  
Insight Into

This interview with Mexican writer David Toscana ponders the current state of both Mexican and Latin American narrative and serves as an insight into his own works. Toscana's statements about the recurring themes in his narrative (failure, loneliness, characters put to the test, and a tendency to play with different time frames, especially in his novels) help illustrate some of the characteristics of his fiction, which, according to various critics, is one of the most promising today in Mexico. Also noteworthy are his comments about the tendency of writers from his generation (born in the 1960s and later) to reject the legacy of the "boom" writers. Toscana's own interest is to revisit history and tradition by constructing a different voice and a different vision, a new way of seeing and hearing both the past and the present. Esta entrevista con el escritor mexicano David Toscana trata de explorar el estado actual de la narrativa mexicana y latinoamericana, améén de servir como una aproximacióón a la incipiente obra de este autor. Las respuestas de Toscana sobre los temas recurrentes en su literatura (el fracaso, la soledad, los personajes sometidos a pruebas y una tendencia a proponer diferentes marcos temporales, especialmente en sus novelas) subrayan algunos rasgos de su ficcióón, la cual, segúún la críítica especializada, es una de las máás prometedoras en el panorama mexicano de hoy. De especial interéés son los comentarios de Toscana sobre la tendencia de los escritores de su generacióón a rechazar el legado del "boom" latinoamericano. Toscana reacciona contra ese rechazo y propone una voz personal que vuelva a la historia y a la tradicióón y plantee una nueva manera de ver el pasado y el presente de Mééxico.

scholarly journals Undergraduate Econometrics Instruction: Through Our Classes, Darkly

2017 ◽  
Vol 31 (2) ◽  
pp. 125-144 ◽  
Author(s):  
Joshua D. Angrist ◽  
Jörn-Steffen Pischke
Keyword(s):  
Paradigm Shift ◽  
Causal Effects ◽  
Economic Research ◽  
Back Seat ◽  
The Past ◽  
Past Half Century ◽  
1960S And 1970S ◽  
The 1960S ◽  
Past Half ◽  
Classical Regression

The past half-century has seen economic research become increasingly empirical, while the nature of empirical economic research has also changed. In the 1960s and 1970s, an empirical economist's typical mission was to “explain” economic variables like wages or GDP growth. Applied econometrics has since evolved to prioritize the estimation of specific causal effects and empirical policy analysis over general models of outcome determination. Yet econometric instruction remains mostly abstract, focusing on the search for “true models” and technical concerns associated with classical regression assumptions. Questions of research design and causality still take a back seat in the classroom, in spite of having risen to the top of the modern empirical agenda. This essay traces the divergent development of econometric teaching and empirical practice, arguing for a pedagogical paradigm shift.

The Past Is before Us: Feminism in Action Since the 1960s

1989 ◽  
pp. 93
Author(s):  
Sara Dunn ◽  
Sheila Rowbotham
Keyword(s):  
The Past ◽  
The 1960S

Kids Today

2018 ◽  
Author(s):  
Angela Duckworth ◽  
Keyword(s):  
Self Control ◽  
Half Century ◽  
The Past ◽  
Past Half Century ◽  
The 1960S ◽  
Past Half

Compared to 50 years ago, are children today better or worse at delaying gratification? If you answered “worse,” then you have company. Roughly 3 out of 4 parents believe that self-control has decreased over the past half-century. Likewise, when given a brief description of the famous marshmallow test, the same proportion of parents guess that preschoolers today are less able to delay gratification than their counterparts in the 1960s. Here's how one older gentleman described the decline of self-controlled behavior among kids of his generation. The children now love luxury; they have bad manners, contempt for authority; they show disrespect for elders and love chatter in place of exercise. Children are now tyrants, not the servants of their households. They no longer rise when elders enter the room. They contradict their parents, chatter before company, gobble up dainties at the table, cross their legs, and tyrannize their teachers.

scholarly journals Homocysteine Modification in Protein Structure/Function and Human Disease

2019 ◽  
Vol 99 (1) ◽  
pp. 555-604 ◽  
Author(s):  
Hieronim Jakubowski
Keyword(s):  
Vascular Complications ◽  
Premature Death ◽  
Epidemiological Studies ◽  
Brain Diseases ◽  
Disease Phenotypes ◽  
The Past ◽  
Nonprotein Amino Acid ◽  
Important Intermediate ◽  
One Carbon Metabolism ◽  
The 1960S

Epidemiological studies established that elevated homocysteine, an important intermediate in folate, vitamin B12, and one carbon metabolism, is associated with poor health, including heart and brain diseases. Earlier studies show that patients with severe hyperhomocysteinemia, first identified in the 1960s, exhibit neurological and cardiovascular abnormalities and premature death due to vascular complications. Although homocysteine is considered to be a nonprotein amino acid, studies over the past 2 decades have led to discoveries of protein-related homocysteine metabolism and mechanisms by which homocysteine can become a component of proteins. Homocysteine-containing proteins lose their biological function and acquire cytotoxic, proinflammatory, proatherothrombotic, and proneuropathic properties, which can account for the various disease phenotypes associated with hyperhomocysteinemia. This review describes mechanisms by which hyperhomocysteinemia affects cellular proteostasis, provides a comprehensive account of the biological chemistry of homocysteine-containing proteins, and discusses pathophysiological consequences and clinical implications of their formation.

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