Alosa algeriensis Alosa algeriensis Alosa algeriensis, the North African shad, is a Mediterranean species of clupeid fish in the shad genus "Alosa". "Alosa algeriensis" is primarily found in the Mediterranean Sea from northern Morocco to northern Tunisia. They are also found in Sardinia, Italy with landlocked populations in Lake Ichkeul, Tunisia and Sardinia, Italy. "Alosa algeriensis" males will begin upriver migration at about 3–4 years old while females do not begin until about 4–5 years old. The juveniles migrate to the mouth of rivers until they mature. Once temperatures rise above 20 degrees Celsius, they will begin their spawn. Mortality usually occurs
Herring juvenile herring could never catch a large copepod. Other pelagic prey eaten by herring includes fish eggs, larval snails, diatoms by herring larvae below , tintinnids by larvae below , molluscan larvae, menhaden larvae, krill, mysids, smaller fishes, pteropods, annelids, "Calanus" spp., Centropagidae, and "Meganyctiphanes norvegica". Herrings, along with Atlantic cod and sprat, are the most important commercial species to humans in the Baltic Sea. The analysis of the stomach contents of these fish indicate Atlantic cod is the top predator, preying on the herring and sprat. Sprat are competitive with herring for the same food resources. This is evident