Reproductive biology of mottled spinefoot (Siganus fuscescens) in Iligan Bay, Philippines: Insights into spawning patterns with consideration of lunar influence

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-07-28 DOI:10.1016/j.fishres.2025.107482

Ahmida I. Lininding , Ephrime B. Metillo , Armi G. Torres , Ivane R. Pedrosa-Gerasmio

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引用次数: 0

Abstract

The mottled spinefoot (Siganus fuscescens), locally known as “Danggit”, holds significant commercial value in the Philippines. This study investigates various reproductive aspects of S. fuscescens, including gonad maturation, sex ratio, spawning season, fecundity, and potential influence of lunar cycle and selected environmental factors on spawning. A comprehensive sampling effort collected 1432 individuals of S. fuscescens from May 2022 to April 2023, with sampling conducted per lunar phase. The total length (TL) and weight of S. fuscescens ranged from 8.8 to 26.8 cm TL (Mean:17.33 cm ±0.08) and 8.1 g to 237.5 g (Mean:72.81 g ± 1.01), respectively. Although there are more females (n = 735) than males (n = 697), the overall sex ratio of 1.05:1 did not significantly deviate from 1:1. Males reached the length at first maturity (L_m50) at a lower size compared to females, with a length at first maturity (L_m50) estimated at 17.54 cm for males and 20.24 cm in females. The absolute fecundity displayed a wide range, from 48,772 to 843,511 eggs, with a mean of 271,327 ± 48,373 eggs. Relative fecundity varied from 44 to 1255 eggs per gram of body weight, averaging 275 eggs/g. A significant correlation was observed between absolute fecundity and ovary weight. Based on the Gonadosomatic Index (GSI), two spawning periods were observed - from May to July 2022 and another from February to April 2023. Within these periods, the highest spawning activity occurred in July 2022 and March 2023, respectively. GSI was highest during the new moon, followed by the first quarter. Among the environmental factors examined, chlorophyll a concentration and precipitation may have significant influence on the spawning of S. fucescens. These findings underscore the importance of robust scientific data to support policy, particularly in implementing regulations prohibiting fishing during species spawning season and fostering sustainable fisheries management practices.

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菲律宾Iligan湾斑驳棘足（Siganus fuscescens）的生殖生物学：考虑到月球的影响，对产卵模式的见解

斑驳棘足（Siganus fuscescens），在当地被称为“Danggit”，在菲律宾具有重要的商业价值。本研究研究了fuscescens生殖的各个方面，包括性腺成熟、性别比例、产卵季节、繁殖力以及月亮周期和选定环境因素对产卵的潜在影响。从2022年5月到2023年4月，我们收集了1432个fuscescens个体，每个月相进行采样。fuscescens的总长度（TL）为8.8 ~ 26.8 cm TL（平均值：17.33 cm±0.08），总重量为8.1 g ~ 237.5 g（平均值：72.81 g ± 1.01）。虽然女性（n = 735）多于男性（n = 697），但1.05:1的总体性别比并未明显偏离1:1。雄性的首成熟长度（Lm50）低于雌性，雄性的首成熟长度（Lm50）估计为17.54 cm，雌性为20.24 cm。绝对繁殖力的范围很广，从48,772 ~ 843,511个卵，平均为271,327个 ± 48,373个卵。每克体重的相对繁殖力为44 ~ 1255个卵，平均为275个卵/克。绝对繁殖力与卵巢重量呈极显著相关。根据促性腺指数（GSI），观察到两个产卵期- 2022年5月至7月和2023年2月至4月。在这些时期，产卵活动最高的时间分别是2022年7月和2023年3月。GSI在新月期间最高，其次是第一季度。在研究的环境因子中，叶绿素a浓度和降水可能对灰尾菜的产卵有显著影响。这些发现强调了强有力的科学数据对支持政策的重要性，特别是在实施禁止在物种产卵季节捕鱼的法规和促进可持续渔业管理做法方面。

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.