凤尾鱼和鳕幼鱼的RNA/DNA及其衍生状态指数可作为渔业综合管理的相关信息

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY Scientia Marina Pub Date : 2022-12-14 DOI:10.3989/scimar.05288.049
M. Diaz, Marina Do Souto, Stefanía Cohen, G. Macchi
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引用次数: 0

摘要

2018年春季,研究了北巴塔哥尼亚锋面系统(NPFS)地区凤尾鱼和阿根廷鳕鱼幼虫的营养状况。我们假设这一区域为幼虫的生长和存活提供了足够的特征。采用RNA/DNA指数(RD)及其衍生的生长性能指标。计算了饥饿的临界RD值。计算了饥饿和最佳生长条件下的个体百分率。由于研究期间是黑鲈产卵期的开始,因此收集到的黑鲈幼虫数量有限。在整个个体发育过程中,鳀鱼幼鱼的RD指数呈显著上升趋势,在弯曲前和弯曲阶段分别为1.84±1.39 (N=739)和2.77±1.50 (N=220)。在靠近NPFS的站点和水柱的上层,这些值明显更高。全天没有观察到任何差异。NPFS内的区域饥饿凤尾鱼比例较低,处于最佳生长状态的个体比例较高,是一个有利的护理区域。仔鱼平均RD为1.64±0.55 (N=15)。RD指数的高度敏感性使其成为评估幼虫存活概率和渔业后招募的有力工具,并允许确定这些重要渔业物种的有利养殖区域。
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RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management
The nutritional condition of anchovy and Argentine hake larvae in the Northern Patagonian Frontal System (NPFS) area was studied in the austral spring of 2018. We hypothesized that this area provides adequate features for larval growth and survival. The RNA/DNA index (RD) and its derived index of growth performance were employed. A critical RD value for starvation was calculated. The percentage of individuals under starvation and in optimal growth conditions was calculated. Because the period of study was the beginning of the hake spawning period, a limited number of larvae of this species were collected. The RD index showed a significant increase throughout larval ontogeny for anchovy larvae, being 1.84±1.39 (N=739) and 2.77±1.50 (N=220) in the pre-flexion and flexion stages respectively. These values were significantly higher at stations close to the NPFS and at the upper level of the water column. No differences were observed throughout the day. The area inside the NPFS showed a lower proportion of starved anchovy and a higher proportion of individuals in optimal growth, standing as a favourable nursing area. For hake larvae, the average RD was 1.64±0.55 (N=15). The great sensitivity of the RD index makes it a powerful tool for assessing the probability of larval survival and posterior recruitment into fisheries and allowing the identification of favourable rearing areas for these important species for fisheries.
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来源期刊
Scientia Marina
Scientia Marina 生物-海洋与淡水生物学
CiteScore
2.10
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Scientia Marina is the successor to Investigación Pesquera, a journal of marine sciences published since 1955 by the Institut de Ciències del Mar de Barcelona (CSIC). Scientia Marina is included in the Science Citation Index since 1998 and publishes original papers, reviews and comments concerning research in the following fields: Marine Biology and Ecology, Fisheries and Fisheries Ecology, Systematics, Faunistics and Marine Biogeography, Physical Oceanography, Chemical Oceanography, and Marine Geology. Emphasis is placed on articles of an interdisciplinary nature and of general interest.
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