Gamete quality in fish: evaluation parameters and determining factors

Area of Science:

• Aquaculture
• Fish reproductive biology
• Aquatic environmental science

Background:

• Fish gamete quality is vital for successful aquaculture and is influenced by numerous factors.
• Broodstock management in hatcheries must account for environmental and nutritional influences on gamete viability.
• Gamete ageing is a critical factor, particularly for species with limited natural spawning capabilities in captivity.

Purpose of the Study:

• To highlight the key factors affecting fish gamete quality in hatchery settings.
• To emphasize the impact of environmental stressors and nutrition on broodstock and gamete quality.
• To underscore the importance of optimal hatchery conditions for ensuring successful reproduction and offspring survival.

Main Methods:

• Review of existing literature on fish broodstock management and gamete quality.
• Analysis of the effects of environmental parameters (water quality, physical and chemical factors) on fish reproduction.
• Evaluation of nutritional impacts on male and female broodstock and their gametes.

Main Results:

• Broodstock age, feeding, water quality, and hatchery conditions significantly impact fish gamete quality.
• Females are generally more sensitive to suboptimal hatchery conditions and poor nutrition than males.
• Inadequate conditions induce stress in broodstock, leading to reduced gamete quality and lower embryonic survival rates.

Conclusions:

• Optimizing hatchery conditions, nutrition, and management is essential for improving fish gamete quality.
• Addressing gamete ageing and stress factors in broodstock can enhance aquaculture productivity.
• Maintaining high-quality gametes is fundamental for the short and long-term survival of embryos, larvae, and fry.