Seasonal variations in the hemocyte parameters, gonad development, energy storage and utilization of the giant honeycomb oyster Hyotissa hyotis (Linnaeus 1758) in Jeju Island off the south coast of Korea

Seasonal monitoring of cellular energy metabolism in a sentinel species, Dreissena polymorpha (bivalve): Effect of global change?

“…This asynchronous spawning could be a consequence of a potential pollution or an accumulation of different exceptional events like drought or flood periods. Concerning energy reserves, lipid content followed the reproduction cycle with a significant decrease in August 2018 concurrently with gamete emission, similarly to what is reported by Kwan et al (2003), Hassan et al (2018) and Hong et al (2020). Since females were mostly represented in our samples for histology analysis, the high lipid content observed until April 2019 might be explained by the accumulation of lipid nutrients in the oocytes (Palais et al, 2011).…”

“…Tourari et al (1988) shown that glycogen was largely used for the formation of the gametes and the gonadal tissues during gametogenesis and is especially converted into lipid materials in maturing oocytes in Dreissena polymorpha. These observations were also highlighted in oysters through an increase of glycogen content in prereproduction period followed by a net decrease during the spawning one (Hong et al, 2020). However, in our study, glycogen storage was significantly lower from April to June in 2019 compared to the same period in 2018.…”

“…However, in our study, glycogen storage was significantly lower from April to June in 2019 compared to the same period in 2018. Reproduction cycle and glycogen content observations did not follow the schema described for Dreissena polymorpha and others bivalves' species (Hong et al, 2020;Palais et al, 2011;Ram et al, 1996Ram et al, , 1993. Glycogen might have been used simultaneously for the gamete development and spawning as well as for other cellular energy demands since glycogen is a main source of energy in organisms (Anacleto et al, 2013;Andrade et al, 2017;Cordeiro et al, 2016Cordeiro et al, , 2017.…”

“…Indeed, the aerobic metabolism can be favoured in order to improve the energy available for fitness-related functions including growth and reproduction (Hochaka and Somero, 2002;Salin et al, 2015;Sokolova and Pörtner, 2001;Sokolova et al, 2012). Environmental factors directly modulate cellular and mitochondrial energy management and the energy allocation to vital functions such as maintenance, growth, reproduction and reserves storage (Amiard and Amiard-Triquet, 2008;Hong et al, 2020;Verslycke et al, 2004). In invasive species, reproduction represents a large part of energy allocation (Louis et al, 2019).…”

Report on the Annual Gametogenesis and Tissue Biochemical Composition in the Gray mussel, Crenomytilus grayanus (Dunker 1853) in the Subtidal Rocky Bottom on the East Coast of Korea

“…In a temperate coastal environment, algal blooms in spring or fall supply a substantial quantity of foods to the suspension-feeding bivalves, and the assimilated foods are stored and mobilized during the gametogenesis (Bayne 1976;Beninger and Lucas 1984;Gabbott and Peek Online ISSN 2005-7172 Print ISSN 1738-5261 1991; Thorarinsdottir and Gunnarsson 2003). The energy required for gametogenesis and subsequent spawning is supplied from the somatic tissues such as a mantle, adductor muscles, and siphons, which are stored previously or directly from recently absorbed and assimilated food (Gabbott 1983;Ahn et al 2003;Uddin et al 2007;Lee et al 2015;Hong et al 2020). Understanding the reproductive cycle of marine mussels is crucial since it is one of the key species in a shallow subtidal benthic ecosystem.…”