2026-10-13T13:06:55Z https://api.figshare.com/v2/oai

oai:figshare.com:article/32751822 2026-10-08T15:39:48Z category_24223 item_type_3 month_year_10_2026

Size-structured monitoring and otolith Sr/Ca data for juvenile<i> Coilia nasus </i>in the Jingjiang tidal freshwater reach, lower Yangtze River (2002–2017) hongyi Guo (23753055) Freshwater ecology Coilia nasus tidal freshwater juvenile recruitment stage-structured monitoring <p dir="ltr">This dataset supports the article "Size-structured monitoring and otolith chemistry reveal recurrent tidal-freshwater use by juvenile Japanese grenadier anchovy Coilia nasus in the lower Yangtze River" (Journal of Fish Biology).</p><p><br></p><p dir="ltr">Fish were sampled with a single fixed T-shaped trap net at the Jingjiang monitoring station, lower Yangtze River, from 2002 to 2017. The survey register contains 551 scheduled retrievals, of which 519 were effective surveys; 10,567 C. nasus were counted and 10,560 were measured for standard length. Missed surveys are recorded as missing, not as zero catches.</p><p><br></p><p dir="ltr">figshare.zip contains five data files and a README with field definitions: the survey register with catch and size-class counts (sampling_events.csv), individual standard lengths and scale-annulus readings (body_lengths.csv), monthly environmental variables for the 192 study months (monthly_environment.csv), conditions on scheduled retrieval days (sampling_day_environment.csv) and LA-ICP-MS core-to-edge Sr/Ca profiles for 115 otoliths (otolith_all_points_20260626.csv; 37,392 points).</p><p><br></p><p dir="ltr">Otolith Sr/Ca values are mass ratios reported as Sr/Ca × 10³, numerically equal to mg Sr per g Ca; they are not molar ratios (multiply by 0.457 to obtain mmol mol⁻¹). The study-specific classification threshold of 3.5 corresponds to approximately 1.60 mmol mol⁻¹.</p><p><br></p><p dir="ltr">The Juvenile Recruitment Index (JRI) is the August–October count of fish <120 mm standard length per effective survey; large-fish CPUE (LBCPUE) is the annual count of fish ≥180 mm standard length per effective survey. Both are relative indices, not estimates of absolute abundance.</p> 2026-10-08T15:39:48Z Dataset Dataset 10.6084/m9.figshare.32751822.v5 https://figshare.com/articles/dataset/Stage-structured_monitoring_data_for_Coilia_nasus_in_the_lower_Yangtze_River/32751822 CC BY 4.0