Andrade Hector, Vihtakari Mikko, Santos Jorge
Institute of Marine Research, Tromsø, Norway.
Faculty for Biosciences, Fisheries and Economics, Norwegian College of Fishery Science, University of Tromsø, Tromsø, Norway.
J Fish Biol. 2023 Nov;103(5):950-964. doi: 10.1111/jfb.15488. Epub 2023 Jul 11.
Research on life-history variations in widely distributed fish species is needed to understand global warming impacts on populations and to improve fisheries management advice. The lane snapper Lutjanus synagris (Linnaeus, 1758) is commercially important to fisheries in the Western Central Atlantic, where spread information on its life-history traits is available. We studied growth, age, reproduction and mortality of lane snapper in the Guatemalan Caribbean, the warmest part of its distribution range, and collated the new information with published data in a latitudinal analysis extending between 18°S and 30°N. Longevity was estimated at 11 years, and von Bertalanffy growth parameters were asymptotic length (Linf) 45.6 and 42.2 cm for females and males, respectively, the growth coefficient (K) was 0.1 year and the theoretical age at zero length (t ) was -4.4 years. Lane snapper grew slowest in April, prior to the rainy season, and at the onset of the reproductive season, which lasted from May to October. Fifty percent of female and male lane snappers matured at 23 and 17 cm, corresponding to 3.5 and 2.4 years of age respectively. A regional multivariate analysis found seawater temperature to be an important driver of life-history variation. Lane snapper lifespan was shorter at the warm edge of its distribution range, and maximum size and peak reproductive investment were negatively related to sea surface temperature. The trade-offs in lane snapper life-history traits and phenology likely enhance its fitness to differing environments. Interpolation from the present regional estimates to less-studied regions of the Caribbean is useful for preliminary understanding of reaction norms and harvest potentials.
为了了解全球变暖对鱼类种群的影响并改进渔业管理建议，需要对分布广泛的鱼类物种的生活史变异进行研究。紫红笛鲷（Lutjanus synagris，林奈，1758年）在西中大西洋渔业中具有重要商业价值，该区域已有关于其生活史特征的传播信息。我们研究了紫红笛鲷在其分布范围最温暖的危地马拉加勒比地区的生长、年龄、繁殖和死亡率，并将新信息与已发表的数据进行整理，进行了一项纬度分析，范围在南纬18°至北纬30°之间。估计其寿命为11年，冯·贝塔朗菲生长参数中，雌性和雄性的渐近体长（Linf）分别为45.6厘米和42.2厘米，生长系数（K）为0.1年，理论零体长年龄（t）为-4.4年。紫红笛鲷在雨季前的4月以及5月至10月繁殖季节开始时生长最慢。50%的雌性和雄性紫红笛鲷分别在体长23厘米和17厘米时成熟，分别对应3.5岁和2.4岁。一项区域多变量分析发现海水温度是生活史变异的重要驱动因素。紫红笛鲷在其分布范围的温暖边缘寿命较短，最大体型和繁殖投资峰值与海面温度呈负相关。紫红笛鲷生活史特征和物候的权衡可能增强其对不同环境的适应性。从当前区域估计值插值到加勒比地区研究较少的区域，有助于初步了解反应规范和捕捞潜力。
