| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2203668 | Tissue and Cell | 2015 | 10 Pages |
•Testis ultrastructural and histological features in the invasive Pterygoplichthys disjunctivus from Marikina River, Philippines were characterized for 1 year.•Testicular tubules contain cysts that undergo group synchronous development.•Male P. disjunctivus attain peak spawning period during rainy months.•Testis of samples were observed resting and recrudescent during dry months of the year.•Aggressive mechanical control is proposed when fish are not in their spawning mode to control the massive proliferation of fish in the area and similar freshwater bodies.
The histological and ultrastructural features of the testis of the invasive suckermouth sailfin catfish Pterygoplichthys disjunctivus rapidly proliferating in Marikina River, Philippines were characterized during the fish's 2010–2011 reproductive season. The germinal compartment of the testes was composed of anastomosing tubules with cysts undergoing synchronous development. Spermatogenic cells were along the length of the testes indicate it to be of the unrestricted spermatogonial type. The spermatozoon is classified as type 1 ect aquasperm devoid of acrosome, has rounded nucleus, and a long flagellum – characteristics necessary for external fertilization. Male P. disjunctivus was reproductively active during half of the year-long study with peak spawning during the most rainy months (June–August) and prolonged recrudescence during the dry months (February–May). Results from this study form a histological baseline to describe the gonad dynamics and reproduction of this invasive fish species as well as provide possible means of mechanical control to curb the population of the fish in this river.
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