In this study, we sought to characterize the effect of water vibration frequency stress on crimson snapper (Lutjanus erythropterus) survival to determine an optimal transportation speed. To achieve this, we used a transport tank (25 cm × 17 cm × 16 cm) to simulate the transport process. After 8 h at five different vibration frequencies (D1 = 75 rpm, D2 = 105 rpm, D3 = 135 rpm, D4 = 165 rpm, and D5 = 195 rpm), the pH and dissolved oxygen (DO) levels in the tanks decreased; ammonia nitrogen levels (NH₄-N) and temperature (T) increased with increasing density; and significant changes in oxidative stress biomarkers, digestive enzymes, and ATPase levels were observed in crimson snapper fry. The enzyme activity increased and reached the maximum value at 195 rpm. The experimental results suggested that during the actual transport, when using transport tanks, the length of the transport time was less than 8 h, and setting the vibration frequency for transportation at 135 rpm was more appropriate, that is, a speed of 50 km/h for transporting crimson snapper fry.

SOXE transcription factors, including SOX8, SOX9, and SOX10, regulate several developmental events, such as sex determination, chondrogenesis, and neurogenesis. This study systematically identified six SoxE subfamily genes from the turbot (Scophthalmus maximus) genome and transcriptome, including SmSox8a, SmSox8b, SmSox9a, SmSox9b, SmSox10a, and SmSox10b. The duplicates of three SOXE members revealed that SoxE subfamily genes in the turbot underwent significant expansion. Relatively conserved exon-intron structures and intron insertions were detected using genomic structural analysis. Besides, phylogenetic analysis supported the previous classification of the SoxE subfamily. Results of the expression profile revealed that turbot SoxE subfamily genes may be involved in different activities, such as neurogenesis and gonad development. These findings would assist in the understanding of fish SoxE gene subfamily activities and evolution.