Growth and productivity of orange roughy(Hoplostethus atlanticus)on the north Chatham Rise
作者:
PamelaM. Mace,
JackM. Fenaughty,
RalphP. Coburn,
IanJ. Doonan,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1990)
卷期:
Volume 24,
issue 1
页码: 105-119
ISSN:0028-8330
年代: 1990
DOI:10.1080/00288330.1990.9516406
出版商: Taylor & Francis Group
关键词: orange roughy;aging;otoliths;growth;productivity;optimal harvest rates;Pisces;Hoplostethus atlanticus
数据来源: Taylor
摘要:
A new interpretation of orange roughy(Hoplostethus atlanticus)otoliths indicates that growth rates in this species are exceptionally slow. The otolith interpretations were supported by modal analysis of length‐frequency distributions of small juveniles. Parameters of the von Bertalanffy growth function were estimated to be L8= 42.50 cm standard length (SL), K = 0.059 year−1and t0= ‐0.346 year. This gives an average SL after 1, 2, and 3 years of growth of only 3.1, 5.5, and 7.6 cm, respectively. The estimated average age of maturity is 20 years. It is further suggested that maximum age may exceed 50 years, the instantaneous rate of natural mortality is probably below 0.10, and spawning success may be highly variable. This combination of factors makes orange roughy susceptible to overfishing. The optimal instantaneous rate of fishing mortality is estimated to be less than 0.10.
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