نجاح أول تفريخ هرموني مستحث لأسماك القاروص الأوروبي (Dicentrarchus labrax) في القطاع الخاص للاستزراع المائي بليبيا

Abdalla Elmgawshi; Sara Almabruk; Mohamed Saadallah; Mohamed Araibi

doi:10.59743/

Authors

Abdalla Elmgawshi
Sara Almabruk
Mohamed Saadallah
Mohamed Araibi

DOI:

https://doi.org/10.59743/

Keywords:

Artificial spawning , Dicentrarchus labrax, European seabass, , hormonal induction, Lh-RHa

Abstract

This study documents the first successful hormonal-induced spawning of European seabass (Dicentrarchus labrax) in a private commercial hatchery in Libya. Wild broodstock (12 females, 9 males) collected from Farwa Lagoon were conditioned for three months under controlled photoperiod (12 L:12 D → 9 L:15 D) and stepped-down temperature (21 → 14 °C, ≈ 1638 DD). A single intramuscular injection of Lh-RHa (10 µg kg⁻¹) induced ovulation in all females within 72 h. Egg production averaged 16.3% of female body weight (4000 g total). Morphological indices (mean diameter 1000 µm) met established quality thresholds. Despite a female-biased sex ratio (1.3:1), hatching rate reached 50%, already surpassing the 30% typically recorded for imported eggs after transport. Economic analysis indicates a 61% reduction in seed cost (€0.10 vs €0.26 per viable fry). Results demonstrate that locally adapted protocols using wild broodstock can reliably supply high-quality seabass seed, offering a replicable model in Libyan hatcheries and reducing dependence on imported fry.

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