It appears that Christof and Katharina and Barbara "Heras" arrived in America on June 25, 1862 on board the ship: E F Gabain traveling from Bremen to New York.
I presume the person writing down the names mistook "Christof" for "Gustav" but everyone's ages match up perfectly. The best news is that their town of origin was noted: "Wulpback and Hessia", in reality the entry reads: Wulfsbach and Hessia was errantly carried over from earlier entries.
I believe, however, that the town name is really Wolfsbach but since there are multiple towns with this name in Germany - a google search for Wolfsbach and Erras helps to solve the problem; thus, it appears that the Fischer and Erras families are most likely from Wolfsbach in the community of Ensdorf (92266) in the Ober Pfalz, Bavaria, Germany.
Here is the contact information for the pastor of the local catholic church:
Telefon: (0 96 24) 12 20
There is also an Erras in the phone book:
Perhaps by writing to him he may have some old family info.
Hope you find what you are looking for.