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Summary
Effects of eyestalk ablation on androgenic gland (AG) protein synthesis and the following gonad development were determined in reproductive and non-reproductive adult males of the freshwater prawn Macrobrachium nipponense. During the non-reproductive season, the AG cells from intact prawns were characterized by a small amount of vacuolated cytoplasm and highly pycnotic nuclei. The AG cells from unilateral eyestalk ablated prawns (UEA) consisted of developing rough surfaced endoplasmic reticulum (rER) a molting cycle after the operation. The AG cells of bilateral eyestalk ablated prawns (BEA) showed a more extensively developed rER and Golgi complex, which are similar in appearance to AG cells from normal reproductive prawns. The gonads from reproductive prawns were in active spermatogenesis. Eyestalk ablation prompted the progress, particularly in the BEA. The gonads from non-reproductive prawns were under reproductive arrest. The eyestalk ablation induced the non-reproductive prawns to be reproductive. The reproductive performance induced by BEA was as successful as in the normal reproductive prawns in terms of gonado-somatic index (GSI). The GSI of the phased changed prawn was 1.21 whereas the GSI of normal prawns during the reproductive season was 1.10. These data taken together with the AG cell changes suggest that eyestalk ablations appear to induce precocious male gonad development by stimulating AG cells from the prawn.
