

FOLLOWUS
1.School of Marine Science, Ningbo University, Ningbo 315832, China
2.Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang 524013, China
3.Key Laboratory of Aquacultral Biotechnology, Ministry of Education, Ningbo University, Ningbo 315832, China
4.Dingbian County Animal Disease Prevention and Control Center, Yulin 718699, China
wangchunlin@nbu.edu.cn
wanghuan1@nbu.edu.cn
收稿:2025-09-08,
网络首发:2026-10-13,
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Xiaosong JIANG, Kangxiang QIN, Fei WANG, 等. Impact of chloride concentration on survival and osmoregulation in mud crab (
JIANG Xiaosong,QIN Kangxiang,WANG Fei,et al.Impact of chloride concentration on survival and osmoregulation in mud crab (Scylla paramamosain Estampador, 1950) under low-salinity, alkaline conditions[J].Journal of Oceanology and Limnology,
Xiaosong JIANG, Kangxiang QIN, Fei WANG, 等. Impact of chloride concentration on survival and osmoregulation in mud crab (
JIANG Xiaosong,QIN Kangxiang,WANG Fei,et al.Impact of chloride concentration on survival and osmoregulation in mud crab (Scylla paramamosain Estampador, 1950) under low-salinity, alkaline conditions[J].Journal of Oceanology and Limnology, DOI:.
Chloride-type low-salt saline-alkali waters show promise for sustainable aquaculture of the mud crab (
Scylla
paramamosain
Estampador
1950)
but low Cl
-
stress disrupts osmoregulation and homeostasis. We established Cl
-
gradients (0.5–5.0 g/L) to evaluate effects on survival
posterior gill histology
hemolymph osmolality
and io
nic composition
and coupled these with transcriptomic profiling to resolve molecular responses to low-Cl
-
stress. At 0.5-g/L Cl
-
survival decreased markedly; posterior gills exhibited edema and structural lesions; activities of key osmoregulatory enzymes (Na
+
/K
+
-ATPase
Na
+
-K
+
-2Cl
-
cotransporter
V-type H
+
-ATPase
carbonic anhydrase) were suppressed; and hemolymph osmolality and ion balance were disturbed. Conversely
when Cl
-
<math id="M1"><mo>≥</mo></math>
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120007543&type=
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120007521&type=
1.60866666
2.28600001
2.0 g/L
survival increased significantly
tissue damage was alleviated
and physiological homeostasis was restored. Comparative analyses identified an optimal range of 2.0–3.0 g/L (3.0 g/L highest
but not significantly different from 2.0 or 5.0 g/L). Transcriptomics (0.5 vs. 5.0 g/L) revealed significant enrichment of differentially expressed genes in energy-metabolism and transmembrane-transport pathways (mitochondrial translation
oxidative phosphorylation
TCA cycle
proximal tubule bicarbonate reclamation
salivary secretion) and up-regulation of Cl
-
-handling genes (
ClC
-
a
Slc6a5
CA7
). Overall
Cl
-
deficiency triggers an energy-intensive osmoregulatory program that enhances Cl
-
uptake to maintain osmotic homeostasis; practically
maintaining environmental Cl
-
at
<math id="M2"><mo>≥</mo></math>
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120007543&type=
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=120007521&type=
1.60866666
2.28600001
2.0 g/L (preferably 2.0–3.0 g/L) is recommended to secure survival
tissue integrity
and adaptive capacity.
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