Age and growth studies of New Zealand Marine fishes, 1921-90: A review

1992 ◽  
Vol 43 (5) ◽  
pp. 879 ◽  
Author(s):  
LJ Paul
Keyword(s):  
New Zealand ◽  
Growth Parameters ◽  
Marine Fishes ◽  
Age And Growth ◽  
Age Validation ◽  
Quality Of Results ◽  
Growth Studies ◽  
Wide Range ◽  
Commercial Species

The development and use of age and growth studies on New Zealand marine fishes are reviewed. A summary of studies on 62 species is given. In view of the wide range of approaches and variation in the level of validation, the studies are not interpreted in detail, but-where available-age at maturity and maximum recorded age are given. The species for which von Bertalanffy growth parameters are available are listed, but, because of variation in the quality of results, not the values. The direction being taken in ageing studies in New Zealand is discussed: age validation, routine ageing of some major commercial species (leading to modelling), basic age-growth information on little-studied species, and theoretical studies on fish ageing. A comprehensive bibliography is included.

Age and growth of forkbeard, Phycis phycis, in Portuguese continental waters

2013 ◽  
Vol 94 (3) ◽  
pp. 623-630 ◽  
Author(s):  
Ana Rita Vieira ◽  
Ana Neves ◽  
Vera Sequeira ◽  
Rafaela Barros Paiva ◽  
Leonel Serrano Gordo
Keyword(s):  
Growth Parameters ◽  
Growth Zone ◽  
Growth Increment ◽  
Age And Growth ◽  
Von Bertalanffy ◽  
Commercial Species ◽  
Marginal Increment ◽  
Slow Growing ◽  
Annual Growth Increment ◽  
Phycis Phycis

The forkbeard, Phycis phycis, is an important commercial species in Portugal; however, little information is available on its biology. Age and growth of the forkbeard from Portuguese continental waters were studied using 687 otoliths from specimens caught between May 2011 and December 2012. Otoliths were transversally sectioned, and assigned ages were validated by marginal increment analysis and edge analysis, and indices of precision were also calculated to corroborate ageing within and between readers. Validation techniques showed that an annual growth increment is formed every year, corresponding to the succession of an opaque and a translucent growth zone. Specimens ranged from 15.5 to 67.1 cm total length (TL), and their estimated ages ranged between 0 and 18 years. The forkbeard is a relatively slow growing, long lived species, that does not show sexual dimorphism in growth. The von Bertalanffy growth parameters estimated for forkbeard from the Portuguese continental waters were L∞ = 75.14 cm TL, k = 0.10 yr−1 and t0 = −2.09 yr.

scholarly journals Editor's Introduction

2020 ◽  
Author(s):  
Anna Green
Keyword(s):  
New Zealand ◽  
Human Activities ◽  
Research Centre ◽  
Farming Practices ◽  
Critical Juncture ◽  
National Debate ◽  
Wide Range ◽  
Underlying Theme

An underlying theme in this issue is that of place and environment, but the articles build upon a wide range of conceptual approaches, locations, human activities and agency. We begin with Jonathan West’s article on New Zealand lakes. An environmental historian, and J.D. Stout Fellow at the Stout Research Centre in 2019, West’s research comes at a critical juncture when the declining quality of freshwater is the focus of intense national debate and argument. As West points out, the pollution in our lakes is the result of the farming practices and the residential uses of the land around them and resolving or mitigating problems decades in the making is going to pose very difficult questions for us all.

Age and growth parameters for three heavily exploited shark species off temperate eastern Australia

2013 ◽  
Vol 71 (3) ◽  
pp. 559-573 ◽  
Author(s):  
Pascal T. Geraghty ◽  
William G. Macbeth ◽  
Alastair V. Harry ◽  
Jacqueline E. Bell ◽  
Michelle N. Yerman ◽  
...  
Keyword(s):  
Life Histories ◽  
Growth Parameters ◽  
Species Conservation ◽  
Age And Growth ◽  
Shark Species ◽  
Age Validation ◽  
Eastern Australia ◽  
Stock Depletion ◽  
Rates Of Growth ◽  
Age Estimates

Abstract The removal of large predatory sharks from the world's oceans poses profound threats to marine community structure and species conservation. Effective management of exploited shark stocks requires a sound understanding of the life histories of target species. Here we provide the first assessment of age and growth for Carcharhinus brevipinna in Australian waters, and for C. obscurus and C. plumbeus in eastern Australian waters, based on interpretations of vertebral growth bands. In doing so, we provide arguably among the most robust growth parameters to date for the abovementioned taxa on the bases of genetic validation and sample size and distribution, but acknowledge equally a range of limitations—most notably those associated with vertebral ageing and our lack of age validation. Comparatively, the three species displayed both contrasts and consistencies in their growth characteristics off Australia's southeast coast. For all three sharks, rates of growth were greatest in the years immediately after birth, males grew more rapidly than females in the juvenile phase, and females were observed to grow larger, live longer and were generally larger at any given age. Longevity and all modelled growth parameters (L∞, k and L0), however, differed among the three species, and appeared to challenge the findings for conspecific populations in other parts of the world. The validity of these latter comparisons is, however, compromised by a range of confounding factors. Nevertheless, we provide the least conservative k estimates for C. obscurus and C. plumbeus of those previously reported, and extend maximum age estimates for C. brevipinna. In this way, our results have important implications for the assessment of natural mortality, productivity, and hence resilience to stock depletion, in these species in southeastern Australian waters.

scholarly journals Using Digestate as Fertilizer for a Sustainable Tomato Cultivation

2021 ◽  
Vol 13 (3) ◽  
pp. 1574
Author(s):  
Maria Rosaria Panuccio ◽  
Carmelo Mallamaci ◽  
Emilio Attinà ◽  
Adele Muscolo
Keyword(s):  
Growth Parameters ◽  
Tomato Fruit ◽  
Point Of View ◽  
Tomato Production ◽  
Nutritional Values ◽  
Positive Effects ◽  
Physiological Properties ◽  
Wide Range ◽  
Health Promoting

The effects of two digestates split up in liquid and solid fractions were investigated on tomato production. The objectives were (1) to verify if the two digestates different in composition differently affected the growth and the quality of tomato; (2) to assess the effectiveness of the two digestate fractions (liquid and solid) on tomato growth and quality characteristics of the harvested tomato fruit. In short, our results evidenced different effects between the two digestates and also between solid and liquid fractions, suggesting that the type of solid fraction (Uliva or Fattoria) rather than the concentration, or their interaction mainly influenced plant growth parameters. Conversely, the effectiveness of liquid fractions were mostly due to the concentrations rather than to the type of digestate. Results also evidenced positive effects of both digestates on the nutritional values of tomatoes, largely explained by the increase in various health-promoting compounds, including vitamin C, flavonoids, and phenolic compounds. The contemporary increase in these different bio-compounds with a wide range of physiological properties and multi target actions confers to digestate treated tomato a nutraceutical benefit. The use of both fractions of both digestates as fertilizer may represent an effective strategy to obtain, even if in some cases at the expense of growth, high-quality fruit in a sustainable way from an economic and environmental point of view.

The Test Method Research of Electric Light Sources Parameters and Detection of Uncertainty Evaluation

2011 ◽  
Vol 130-134 ◽  
pp. 4114-4117
Author(s):  
Xiao Ling Wang ◽  
Xue Yao Qian ◽  
Zhyingi Dai
Keyword(s):  
Test Method ◽  
Laboratory Measurement ◽  
Light Sources ◽  
Calibration Laboratory ◽  
Quality Of Results ◽  
Wide Range ◽  
Measurement Results ◽  
Important Basis

Characterization of measurement uncertainty as a measure of quality of results, and obtained in the metrology of a wide range of applications. At all levels of certified calibration laboratory measurement, measurement standards of the establishment of technical reports, or identification certificate issued by the calibration and so on, require a higher level in the measuring results are given to provide the corresponding uncertainty. Measuring the quality of the results of the measurement results is a measure of the credibility of an important basis. In this paper, through concrete examples and laboratory measurement of electrical parameters of the light source of the data obtained, the Evaluation of Uncertainty.

scholarly journals Library Users Attempt to Access a Wide Range of Information Beyond Books and Articles through a Single Search Box

2014 ◽  
Vol 9 (4) ◽  
pp. 44
Author(s):  
Sara Sharun
Keyword(s):  
Research University ◽  
Log Analysis ◽  
Quality Of Results ◽  
Research Libraries ◽  
Custom Made ◽  
Wide Range ◽  
Library Users ◽  
Administrative Information ◽  
Ongoing Evaluation

A Review of: Lown, C., Sierra, T., & Boyer, J. (2013). How users search the library from a single search box. College & Research Libraries, 74(3), 227-241. Retrieved from http://dx.doi.org/10.5860/crl-321 Abstract Objective – To identify how users use a single search box. Design – Transaction log analysis. Setting – A large research university in North Carolina, United States of America. Subjects – Search results from a customized single search box on the library’s home page, consisting of 739,180 searches and 655,388 hyperlink selections. Methods – The authors used custom logging software to generate transaction logs of all searches that took place over two semesters (August to December 2010 and January to May 2011) in QuickSearch, a custom-made, combined search application. The study tracked search queries and hyperlink selections, noting which modules in the discovery interface (articles, catalogue, databases, and others) were selected and, from these modules, which hyperlinks were clicked. Main Results – Transaction log analysis was conducted on over 739,000 searches during the two semesters and over 655,000 hyperlink selections from the results interface. The 20 most frequent queries made in QuickSearch were primarily for specific resources (database titles or journal titles), administrative information, and library services. The 153 most popular searches made up 10% of all searches. Hyperlinks to full-text articles (41.5%) and the catalogue (35.2%) accounted for about 76% of the links selected. About 23% of links selected were for other modules (e.g., FAQs, “best bets,” and journal titles). Hyperlinks that led directly to specific items were selected more frequently than hyperlinks to a full list of results. Conclusion – Analysis of user transaction logs suggests that users do not understand what is being searched in a combined search box and that search applications need to direct users more effectively to resources beyond the catalogue and article databases. Users attempt to access a wide range of information from a single search box, and the most commonly used modules in QuickSearch do not serve many of the most frequent queries. Many of the most common queries can be defined and addressed with a predefined list of results, improving the quality of results and the search experience for users. Ongoing evaluation and analysis of the search interface and subsequent optimization for the most frequent queries can improve user experience.

scholarly journals Is Parameters Quantification in Genetic Algorithm Important, How to do it?

2017 ◽  
Vol 6 (3) ◽  
pp. 112
Author(s):  
Hari Mohan Pandey
Keyword(s):  
Genetic Algorithm ◽  
Optimization Technique ◽  
Correct Choice ◽  
Considerable Effect ◽  
Primary Objective ◽  
Grammatical Inference ◽  
Quality Of Results ◽  
Wide Range ◽  
Global Optima

The term “appropriate parameters” signifies the correct choice of values has considerable effect on the performance that directs the search process towards the global optima. The performance typically is measured considering both quality of the results obtained and time requires in finding them. A genetic algorithm is a search and optimization technique, whose performance largely depends on various factors – if not tuned appropriately, difficult to get global optima. This paper describes the applicability of orthogonal array and Taguchi approach in tuning the genetic algorithm parameters. The domain of inquiry is grammatical inference has a wide range of applications. The optimal conditions were obtained corresponding to performance and the quality of results with reduced cost and variability. The primary objective of conducting this study is to identify the appropriate parameter setting by which overall performance and quality of results can be enhanced. In addition, a systematic discussion presented will be helpful for researchers in conducting parameters quantification for other algorithms.

scholarly journals New Technology and the Quality of Working Life in New Zealand

1970 ◽  
Author(s):  
Chris Hector
Keyword(s):  
New Zealand ◽  
New Technology ◽  
Working Life ◽  
Postal Questionnaire ◽  
Economic Effects ◽  
Quality Of Working Life ◽  
Wide Range ◽  
Management School ◽  
The Impact

The Waikato Management School has a FoRST contract to investigate a wide range of social and economic effects of new technology. In order to assess the impact o f new technology on the quality of working life a postal questionnaire was distributed to 1800 adults selected at random across the whole of New Zealand. The present findings are preliminary, as only 274 usable responses have been received by Conference time, and they are continuing to arrive. The overwhelming majority of respondents (some 83%) say they are generally satisfied with their paid jobs, despite more than 70% reporting that pressure has increased. Those workers who have been affected by technological change are substantially more likely to say that their work is now more interesting, in addition to being more often among the better paid.

scholarly journals Marketing herbage seeds

1985 ◽  
Vol 3 ◽  
pp. 93-97
Author(s):  
R.G. Smith ◽  
R.D.J. Mather
Keyword(s):  
New Zealand ◽  
Significant Contribution ◽  
Contributing Factors ◽  
Pastoral Development ◽  
Wide Range

One of the most underrated factors in our pastoral development has been the humble seed. Rarely recognised, it has made a significant contribution in allowing farmers to increase production within the wide range of climatic and fertility environments encountered in our country. But now, the quality of New Zealand pastures is becoming internationally recognised and has been one of the main contributing factors in the development of our country, together with the drive and competence of our farming fraternity and the abundant use of fertiliser.

Variable growth band deposition leads to age and growth uncertainty in the western wobbegong shark, Orectolobus hutchinsi

2007 ◽  
Vol 58 (9) ◽  
pp. 856 ◽  
Author(s):  
Justin A. Chidlow ◽  
Colin A. Simpfendorfer ◽  
Garry R. Russ
Keyword(s):  
Growth Rates ◽  
Growth Parameters ◽  
Somatic Growth ◽  
Age And Growth ◽  
Age Validation ◽  
Band Formation ◽  
Growth Band ◽  
Total Length ◽  
In Captivity ◽  
Elasmobranch Species

Age and growth parameters of Orectolobus hutchinsi were estimated using micro-radiographs of sectioned vertebrae from 182 wild caught individuals. Two fluorochrome marker dyes, calcein and oxytetracycline, were used to validate the timing and periodicity of vertebral band formation in nine individuals held in the laboratory for between 423 and 472 days. Growth bands were difficult to interpret and final counts were obtained from only 98 (53.8%) individuals ranging in total length (TL) from 63 to 146 cm. The timing of growth band formation in the vertebrae of captive animals had no predictable temporal pattern, with formation occurring during all seasons of the year, making age validation difficult. Growth band formation was hypothesised to be influenced by non-periodic changes in centrum or somatic growth rather than seasonal growth, as observed in many other elasmobranch species. Growth rates of nine O. hutchinsi held in captivity varied considerably, ranging from 3.5 cm year–1 to 13.8 cm year–1 in total length (mean = 7.03 cm year–1). Although the periodicity of vertebral band formation in captive animals did not support a synchronous annual pattern, captive growth rates matched those predicted when an annual band pattern was assumed for wild caught individuals. Von Bertalanffy growth parameters estimated from vertebral analysis assuming an annual banding pattern and a mean size of birth of 24.1 cm were: L∞ = 149.45 cm and K = 0.117 year–1 for both sexes combined. These results illustrate the fundamental importance of validating the periodicity of growth band formation in elasmobranch age and growth studies as it has considerable implications for the management of fisheries that exploit shark and ray species that may exhibit asynchronous growth band deposition.

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