Taylor Brett M, Cruz Eric
Joint Institute for Marine and Atmospheric Research, University of Hawaii, Honolulu, HI, United States of America.
Guam Field Office, NOAA Pacific Islands Fisheries Science Center, Barrigada, Guam, United States of America.
PeerJ. 2017 Nov 29;5:e4079. doi: 10.7717/peerj.4079. eCollection 2017.
The Pacific longnose parrotfish (Valenciennes 1840) represents a prime fishery resource throughout much of the tropical Pacific. In this study, we sampled the species from the Guam commercial fishery market across five consecutive years to characterize reproductive and age-based demographic information imperative for informed fishery management. Compared with other parrotfishes, this species was found to be large-bodied, but has only a moderate life span of 10 + years. was confirmed as a diandric protogynous hermaphrodite with highly sex-specific growth patterns and an overall mean asymptotic length of 434 mm fork length (FL). Females were estimated to reach median maturity at 329 mm FL (2.4 years) and have a median length at female-to-male sex change of 401 mm FL. Life-history trait values derived here were used to update previous models relating life history and vulnerability to overexploitation. We found that enhancement of just one species' trait values improved model fits considerably, which strengthens the conclusion that life-history traits are a strong determinant of species' vulnerability in the parrotfishes. This information is an imperative complement to other data sources facilitating formal stock assessment of a key fishery target.
太平洋长鼻鹦嘴鱼（瓦朗谢讷，1840年）是热带太平洋大部分地区的主要渔业资源。在本研究中，我们连续五年从关岛商业渔业市场采集该物种样本，以确定对明智的渔业管理至关重要的繁殖和基于年龄的种群统计信息。与其他鹦嘴鱼相比，该物种体型较大，但寿命仅为10多年，属于中等水平。已确认其为双雄性雌性先熟雌雄同体，具有高度性别特异性的生长模式，平均渐近全长为434毫米叉长（FL）。估计雌性在叉长329毫米（2.4岁）时达到成熟中位数，从雌性转变为雄性时的长度中位数为叉长401毫米。此处得出的生活史特征值用于更新先前关于生活史与过度开发脆弱性之间关系的模型。我们发现，仅提高一个物种的特征值就能显著改善模型拟合，这强化了生活史特征是鹦嘴鱼物种脆弱性的重要决定因素这一结论。这些信息是对其他数据源的重要补充，有助于对关键渔业目标进行正式的种群评估。
