## 4 Discussion
This suggests that marine organisms may redirect energy towards maintaining body tissue when external shell formation is compromised by ocean acidification [36; 46]. The increased meat yield of the queen scallops maintained in the tanks with a reduced pH and an elevated temperature may be attributed to their successful acclimation, as observed in _X. securis_ in experiments with acidity and high temperatures [15]. Earlier research has emphasized the remarkable ability of mussels to safeguard their soft tissues from the harmful effects of ocean acidification. [PERSON] et al. [47] demonstrated that despite the challenges posed by reduced pH levels, mussels exhibit physiological mechanisms that enable them to maintain the integrity of their soft tissues. This resilience likely stems from adaptive responses that allow mussels to allocate resources more efficiently, ensuring tissue preservation even under the stressful environmental conditions caused by acidified waters. Interestingly, while the growth rates of the queen scallops in this study were inhibited, an increase in their adductor muscle index was observed, indicating a possible compensatory mechanism to maintain functionality under stress. The higher adductor and gonadosomatic indices under decreased pH conditions suggest that their energy allocation may have shifted towards muscle and reproductive tissue development, potentially at the expense of shell growth. However, the lower gonadosomatic index compared to that in the control group could reflect a trade-off between energy demands, where reproduction is maintained but not fully optimized [33; 35]. These findings contribute to a broader understanding that environmental stressors, such as ocean acidification, significantly affect marine bivalves through alterations in their energy allocation and physiological responses [23; 36; 37]. While earlier studies on bay scallops primarily concentrated on the detrimental impacts of ocean acidification as a significant climate change threat [17], mounting evidence suggests that rising ocean temperatures pose an even greater challenge. Heat stress appears to be the more immediate and critical factor affecting scallop survival, with scallops likely to experience mortality due to elevated temperatures well before the effects of acidification become fatal. The abovementioned research underscores that warming, rather than acidification, may be the primary driver of stress in these organisms as global temperature rise. The results from this study indicate that elevated temperature had a notable impact on the growth and physiological indices of the queen scallops. Specifically, an increase in temperature resulted in a decreased weight growth rate and length growth rate in the scallops, suggesting that while their overall biomass accumulation slowed, their linear shell growth was enhanced. This pattern may reflect a reallocation of energy resources, where scallops prioritize shell extension over mass gain in response to thermal stress [48]. The shift toward higher optimal growth temperatures with increased food availability occurs because bivalves can tolerate higher temperatures better when ample food is available. [PERSON] and [PERSON] [23] investigated the combined effects of temperature and food availability on the growth of mussels (_Mytilus edulis_ and _M. galloprovincialis_) and oysters (_Crassostrea gigas_ and _Ostrea edulis_), highlighting how temperature effects are strongly influenced by food conditions. Said study demonstrated a clear relationship between food availability and growth rates in mussels. Under conditions of a low food supply, the maximum shell growth rate of the mussels was measured at 0.0283 \(\pm\) 0.0060 mm/day, but this rate significantly increased to 0.1703 \(\pm\) 0.0297 mm/day when food levels were abundant. Similarly, their maximal specific growth rate ranged from 0.2651 \(\pm\) 0.0191 mm/day at low food concentrations to a remarkable 1.7697 \(\pm\) 0.2177 mm/day with a higher food availability.