Untitled

Abstract

Bearded horse mussel and Noah's ark shell are sometimes observed to live together in groups. Oxygen consumption, ammonia excretion and clearance rate were investigated on these species under laboratory conditions considering different size of individuals divided into three size groups (less than 25 mm; 25 to 50 mm and larger than 50 mm). Body size of both species significantly influenced oxygen consumption, ammonia excretion and clearance rate of the Noah's ark shell. In both species, respiration and clearance rate decreased with body size while excretion rate increased with body size. For Noah's ark shell groups of 25 to 50 mm and smaller than 25 mm, the atomic ratio between oxygen consumption and ammonium excretion i.e. O:N ratio was detected to be greater than 30. The same applies to a group of the bearded horse mussels smaller than 25 mm. Animals of both species larger than 50 mm have O:N ratio smaller than 30 indicating use of proteins as metabolic substrate, compared to use of lipids and carbohydrates in younger animals.

The Effect of Food Quantity on Physiological Responses of the Bearded Horse Mussel Modiolus Barbatus and the Noah’s Ark Shell Arca Noae

“…M. barbatus starving 15 days showed two times higher metabolic cost than A. noae in same conditions. Higher metabolic cost of respiration of M. barbatus was observed in comparison to A. noae (Glavić et al, 2018). Species inhabiting shallow coastal waters have more food and a less need for respiratory adaptation (Newell and Branch, 1980), what is case with Mali Son Bay (Meštrov and Požar-Domac, 1981) so both investigated species probably did not need physiological adjustment on the amount of given food over the duration of the experiment.…”

“…There are many studies on physiological responses of M. barbatus with regard to stress caused by temperature changes asmetabolic and molecular responses to stress (Anestis et al, 2008;Katsikatsou et al, 2009Katsikatsou et al, , 2010, biochemical and cellular response to stress (Dimitriadis et al, 2012), climate change impact (Katsikatsou et al, 2012), and the interaction of heavy metals and temperature (Katsikatsou et al, 2011). Differences in physiological responses due to differences in body size have been documented for A. noae and M barbatus (Glavić et al, 2018).…”

Influence of Salinity on Physiological Response of the Bearded Horse Mussel Modiolus barbatus and Noah’s Ark Shell Arca noae

“…Age, growth rate, reproductive biology and aquaculture potential studies were performed on Noah's ark shell (Peharda et al, 2002(Peharda et al, , 2006(Peharda et al, , 2013. Literature shows very little data on the physiological response of Noah's Ark shell (Glavić et al, 2018).…”