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A Growth Model for Arctica islandica: The Performance of Tanaka and the Temptation of Von Bertalanffy—Can the Two Coexist?
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2023
Source: Journal of Shellfish Research, 42(1)
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Journal Title:Journal of Shellfish Research
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Description:Organisms increase in size over time (age) due to excess assimilation over metabolic (respiration) energy demands. Most organisms reach a maximum size with increasing age as gain and loss balance. The von Bertalanffy length-at-age relation- ship, which is commonly used in fishery assessment calculations, imposes such a maximum size. However, some fished species, such as ocean quahogs, Arctica islandica, are long lived and continue to grow at old age. The Tanaka age-at-length relationship has continued growth at old age, but is rarely used in stock assessment models. A modified form of the von Bertalanffy model is presented, which mimics the continued growth at old age of the Tanaka model by allowing the growth parameter (K) to decline with age. This form is suitable for inclusion in stock assessment models based on von Bertalanffy. The proposed model matches
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Source:Journal of Shellfish Research, 42(1)
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ISSN:0730-8000
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Rights Information:Other
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