Effects of salinity on the growth and mucous cells of the abalone Haliotis diversicolor Reeve, 1846

Abstract

This study was conducted to determine the influence of salinity on the growth of abalone Haliotis diversicolor Reeve, including the density and size of mucous cells. Abalone individuals were reared in the laboratory at salinities of 20, 25, 31, 35 and 40 ppt. The mucous cells of the lips, gills and digestive gut of H. diversicolor, which react to some forms of stress such as suboptimal salinity, were characterized following staining with Alcian Blue-Periodic Acid-Schiff's Reagent (AB-PAS). The specific growth rate in wet weight and shell length of H. diversicolor were highest at 31 ppt and lowest at 20 ppt (0.52 vs 0.15% d -1 , and 0.058 vs 0.021 mm d -1 , respectively). The abalone H. diversicolor tolerated salinity fluctuations within the range of 20-40 ppt, but growth was optimum at 25-35 ppt. Mucous cells of the lips and gills showed significant differences (ANOVA, df = 4, P = \0.001) in cell density and cell size, being less dense and larger at 31 ppt than at 40 ppt, which could be an effect of osmotic and ionic regulation. Consistent with reports in literature, salinity ranges of 25-35 ppt are suitable for growth of H. diversicolor. Results of this study indicated that areas with such salinity are favorable for stock enhancement and mariculture of the abalone H. diversicolor.

Transcriptome analysis reveals fluid shear stress (FSS) and atherosclerosis pathway as a candidate molecular mechanism of short-term low salinity stress tolerance in abalone

“…Under aquaculture conditions, abalone encounters diverse environmental challenges such as salinity fluctuation. Particularly, abalones on farms in the coastal and inner bays could experience prolonged low salinity conditions due to freshwater intrusion [ 3 , 4 ]. Moreover, abalone encounters a sudden drop in seawater salinity during severe summer rainstorms and typhoon events [ 5 ].…”

Sub‐low salinity impact on survival, growth and meat quality of the Pacific abalone ( Haliotis discus hannai ) and hybrids

“…It is evident that sub‐low salinity influences survival and growth of the Pacific abalone, besides other factors such as temperature (Chen et al., 2016) and hypoxia (Shen, Huang, Liu, Ke, & You, 2019). However, there is no literature as to whether sub‐low salinity could impact the biochemical composition of the Pacific abalone; and what salinity range could be regarded as optimal for securing the nutritive value—because most Haliotis species can endure a wide range of 25–45 (Creencia & Noro, 2018).…”

Population genetic and genomic approaches for the management of the blackfoot paua, Haliotis iris Gmelin 1791, within the genus context

“…Asia, in particular Japan, Korea and China, has been leading the farmed production of abalone since the 1970s (Gordon & Cook, 2013;Cook, 2014;Cook, 2016;Cook, 2019). Subsequently, most scientific literature revolving around the abalone species (and their hybrids) found in the region aims at describing specific aspects of their biology and reproductive cycle (Wang et al, 2019;Sharker et al, 2020), as well as pathogen and environmental stress resistance (You et al, 2019;Hong et al, 2019;Liang et al, 2021;Yu et al, 2022) and growth enhancement (Alcantara Creencia & Noro, 2018;Gao et al, 2018;Dai & Cho, 2022). Outcomes of these studies are applicable to aquaculture and breeding programs in farms or that could increase the species' market price.…”