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Simple Summary: Optimizing production strategies for clam farming is crucial to achieve economic and biological sustainability. Improving broodstock-conditioning conditions, such as the geographical origin, timing of collection, temperature, and nutrient levels, can significantly enhance outcomes. Developing Moroccan hatcheries rearing protocols adapted to local environmental factors promotes sustainable aquaculture, making clam farming a more feasible and profitable industry for the country. Effective broodstock conditioning is critical for producing high-quality larvae and spat in bivalve hatcheries. This study aimed to assess the impact of the geographic origin and season of collection on broodstock-conditioning performances to design optimal clam rearing programs. The grooved carpet shell clam (Ruditapes decussatus), widely found along Morocco's coasts and estuaries, is a key economic resource due to its high market value. However, clam production has declined over recent decades, largely due to the overexploitation of natural beds, and recruitment failures, leading to a limited wild spat availability. This study examined how the broodstock collection season (winter vs. summer) and origin (South Atlantic vs. North Mediterranean) affect broodstock performances in hatcheries. The maturity development (condition index (CI) and gonadal condition index (GCI)), histological examination, and reproductive output were evaluated. The results showed that Mediterranean clams achieved a higher maturity during winter conditioning (CI = 13.60 ± 1.02, GCI = 6.01 ± 0.90) than the Atlantic population (CI = 11.51 ± 1.50, GCI = 5.31 ± 1.14). Moreover, Mediterranean clams produced more oocytes per female (2.34 million), despite the lower spawning rate (42%), compared to the Atlantic clams (1.68 million) with a 69% spawning rate by the end of the winter conditioning. These findings highlight the importance of selecting broodstock by geographic origin to optimize shellfish hatchery production. [ABSTRACT FROM AUTHOR]