Inconsistency between salinity preference and habitat salinity in euryhaline gobiid fishes in the Isazu River, northern Kyoto Prefecture

Preference for saline water of an amphidromous goby maintained during migration to upstream freshwater areas

“…The strength of preference for saline water might not change greatly following growth because juvenile body size did not correlate with the strength of brackish water preference. A very slight difference in the brackish water preference between juvenile (this study) and adult (Oto et al, 2017) also supports this. Thus, G. petschiliensis consistently expresses a preference for saline water over freshwater from juvenile to adult stages.…”

“…These results are consistent with the adult preference for similar salinity, rather than freshwater, as reported by Oto et al . (2017). Moreover, juveniles showed no preference between brackish water and seawater at a salinity of 35.…”

“…If juveniles prefer brackish water or seawater to freshwater, they are migrating upstream against their preference. However, in the context of adults preferring brackish water at a salinity of 20 to freshwater (Oto et al ., 2017), the opposite result suggests that the preference for saline water develops after inhabiting stream areas. To further illustrate the role of fish growth in developing the preference for saline water, the relationship between the strength of preference toward brackish water and body size was analysed.…”

“…Acclimation salinity, acclimation period, standard length (L S ), body wet mass (M W ) and total number of individuals (n) of G. petschiliensis used in each experimental group To further discuss the relationship between the salinity preference and growth, the residual difference in NFL when fish were acclimated to BW was compared between juvenile and adult by the Wilcoxon rank sum test, using the data inOto et al (2017), in which adult preference was tested in the similar way. In all tests, 0.05…”

High chromosomal evolutionary dynamics in sleeper gobies (Eleotridae) and notes on disruptive biological factors in Gobiiformes karyotypes (Osteichthyes, Teleostei)

“…Its wide geographic distribution covers the areas of Oceania, Asia, Europe, North America, and Latin America, inhabiting marine, brackish and freshwater environments. Some species live in hypersaline waters or even great oceanic depths (Muus and Nielsen 1999;Oto et al 2017;Suzuki et al 2015), however they generally occur in estuaries, rocky marine coasts, or are associated with coral reefs (Baensch and Riehl 1991;Kottelat and Freyhof 2007;Patzner et al 2012). Their reproductive strategies include (1) parental care for eggs and larvae, (2) internal or external fertilization and (3) males' sex change under certain environmental conditions (Nakashima et al 1996;Skóra et al 1999).…”