全球智库信息集成服务系统(G2TT): Age at maturation predicted from routine scale measurements in Norwegian spring-spawning herring (Clupea harengus) using discriminant and neural network analysis.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1016/S1054-3139(03)00017-1
	Age at maturation predicted from routine scale measurements in Norwegian spring-spawning herring (Clupea harengus) using discriminant and neural network analysis.
	Engelhard GH; Dieckmann U; Godoe OR
发表日期	2003
出处	ICES Journal of Marine Science 60 (2): 304-313
出版年	2003
语种	英语
摘要	We evaluate two methods allowing the prediction of age at maturation from the widths of the annual growth layers in scales (or otoliths) in a case study on Norwegian spring-spawning herring. For this stock, scale measurements have been made routinely for many decades. We compare the performance in classifying age at maturation (at 3, 4,..., 9 years) between conventional discriminant analysis (DA) and the new methodology of artificial neural networks (NN) trained by back-propagation against a 'control' of historical estimates of age at maturation obtained by visual examination of scales. Both methods show encouraging, and about equally high, classification success. The marginal differences in performance are in favour of DA, if the proportion of correctly classified cases is used as criterion (DA 68.0%, NN 66.6%), but in favour of NN if other criteria are used, including prediction error (error >1 year: DA 5.2%, NN 2.9%), and the average degree of under- or overestimation (underestimation 1.1% of mean with DA; overestimation 0.2% of mean with NN). Evidence is provided that both methods approach the a priori limits to maximal classification success, limits set by overlapping combinations of predictor variables between maturation groups. The methods allow studies on age at maturation in this stock over a very long timespan, including periods well before, during, and after its collapse to commercial extinction. Similar techniques might well be applicable to any other fish stock with long-term data on scale or otolith growth layers.
主题	Adaptive Dynamics Network (ADN)
关键词	Age at maturation Classification Discriminant analysis Growth layers Neural network Norwegian spring-spawning herring Scale measurements
URL	http://pure.iiasa.ac.at/id/eprint/6892/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/128279
推荐引用方式 GB/T 7714	Engelhard GH,Dieckmann U,Godoe OR. Age at maturation predicted from routine scale measurements in Norwegian spring-spawning herring (Clupea harengus) using discriminant and neural network analysis.. 2003.