digraph fish {
    size="6,6";
    node [color=lightblue2, style=filled];
    rankdir=LR;
    
    
    s10[label="k=0"];
    s11[label="k=1"];
    s1other[label="...", style=none, border=0, color=white];

    s20[label="k=0"];
    s21[label="k=1"];
    s2other[label="...", style=none, border=0, color=white];

    F1[label="fish #1"];
    F2[label="fish #2"];
    
    
    ""->F1[label="p=0.7"];
    ""->F2[label="p=0.3"];
    F1->s10[label="P(k=0|#1)"];
    F1->s11[label="P(k=1|#1)"];
    F1->s1other[label="..."];

    F2->s20[label="P(k=0|#2)"];
    F2->s21[label="P(k=1|#2)"];
    F2->s2other[label="..."];
    
}