Analyses of fin ray types to detect strontium markers in juvenile blunt-snout bream Megalobrama amblycephala

• DOI: 10.1186/s13717-024-00501-z
• Publication Date: 2024-02-29T04:44:01Z
• Authors: Yahua Zhu; Tao Jiang; Xiubao Chen; Hongbo Liu; Quinton Phelps; Jian Yang
• Keywords: Megalobrama; Fish fin; Dorsal fin; Snout; Fin

Abstract Background Restocking by introducing hatchery-reared fish into wild habitats aids in the restoration of fishery aquatic ecosystems and reefs to increase abundance resources, restore ecological balance water bodies, enhance ecosystem functioning. Accurately, rapidly, effectively evaluating success restocking using chemical markers (e.g., strontium [Sr]) remains challenging for fisheries management. Consequently, non-lethal sampling, hard tissues, such as fin rays, have received increasing attention a target marking method. However, data on differences different types rays remain limited. Therefore, we exposed juvenile blunt snout bream individuals ( Megalobrama amblycephala ) 0 (control group) or 800 mg/L SrCl 2 ·6H O (marked 5 days transferred them normal aerated post-immersion culture. We sampled their pectoral, dorsal, ventral, anal, caudal rays. The Sr marks among were at 20 evaluated an electron probe micro-analyzer (EPMA) five-day Sr/Ca ratios, along with line transect mapping analyses. Results signatures observed all marked group, rate up 100%. Although efficiency varied ray types, highest ratios most often detected dorsal fin. Cross-sectional concentration maps showed high-Sr domains group; contrast, entire cross-sections control group displayed low contents, indicating successful efficiency. Conclusions Fin is method M. , advantages non-lethality negligible sampling injuries, facilitating rapid effective evaluation .