Acute salinity tolerance of silver therapon, leiopotherapon plumbeus

Issue Date

12-2020

Abstract

Despite the ecological and economic importance of silver therapon (Leiopotherapon plumbeus (Kner, 1864)), there is still no information regarding the salinity tolerance of this endemic freshwater terapontid. The present study evaluated the acute salinity tolerance of silver therapon. Salinity toxicity test (LC50 at 96 h) determined the toxicity limit of 315 unsexed L. plumbeus (4.39±0.39 cm) using seven salinity treatments (0, 7.5, 15, 20, 25, 30, and 35 g L-1). Using the graphical method, LC50 projected salinity toxicity of approximately 29.92 g L-1, albeit Probit analysis estimated a mean LC50 of about 30.70 g L-1. After 96 h, 0, and 7.5 g L-1 salinity treatments obtained zero mortality, whilst 15, 20, and 25 g L-1 acquired < 7% mortality. Mortality rates of 51.11% and 62.22% were recorded at 24 h in treatments 30 g L-1, and 35 g L-1, respectively. Log-rank analysis of the Kaplan-Meier function determined the significant difference of sample survival times in different salinity concentrations (X2 = 123.76), with an apparent decrease in survival rate that occurred in 30 g L-1 salinity. This preliminary study demonstrated that L. plumbeus can tolerate direct transfer to brackish water and can even survive in seawater.

Source or Periodical Title

AACL Bioflux

ISSN

1844-8143

Volume

13

Issue

6

Page

3656-3663

Document Type

Article

Physical Description

graph, tables, references

Language

English

Subject

Ayungin, Bataan, Brackishwater, LC 50, Probit analysis

Digital Copy

Yes

En – AGROVOC descriptors

AYUNGIN BATAAN; BRACKISHWATER; LC50; PROBIT ANALYSIS

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