The North American catfish, the black bullhead Ameiurus melas , is recorded for the first time in Poland. The origin of these fish is not clear, but their presence may be associated with unregulated introductions by anglers.

The inherent ability of the carp Cyprinus carpio gut to absorb intact salmon gonadotropin hormone‐releasing hormone analogue (sGnRH‐a)+Pimozide (Pim), without loss of their bioactivity is very limited. Artificial intestinal absorption enhancement boosted sGnRH‐a and Pim induced GtH II release and milt production significantly. The intraperitoneal route of administration was more effective than the oral one. A potential applica...