The biologists, however, keep trying. Last year, the aquarium in Pula celebrated the second birthday of a noble pen shell it has named Morana, which is still alive today. Some specimens in the aquarium located in the Spanish city Murcia, meanwhile, have managed to survive for five years. Rare cases like these leave hope that maturation and even reproduction in captivity is possible. In the meantime, some scientists are using another approach: searching for adult specimens out on the open sea resistant to disease and transporting them to safe locations in lagoons, in a bid to create a new population capable of reproducing.