bycatch                package:UsingR                R Documentation

_N_u_m_b_e_r _o_f _A_l_b_a_t_r_o_s_s_e_s _a_c_c_i_d_e_n_t_a_l_y _c_a_u_g_h_t _d_u_r_i_n_g _a _f_i_s_h_i_n_g _h_a_u_l

_D_e_s_c_r_i_p_t_i_o_n:

     This data set from Hillborn and Mangel contains data on the number
     of Albatrosses accidentally caught while fishing by commercial
     fisheries.

_U_s_a_g_e:

     data(bycatch)

_F_o_r_m_a_t:

     A data frame with 18 observations on the following 2 variables.

     _n_o._a_l_b_a_t_r_o_s_s The number of albatross caught

     _n_o._h_a_u_l_s Number of hauls with this many albatross caught

_D_e_t_a_i_l_s:

     During fishing operations non-target species are often captured.
     These are called "incidental catch". In some cases, large-scale
     observer programs are used to monitor this incidental catch.

     When fishing for squid, albatrosses are caught while feeding on
     the squid at the time of fising. This feeding is encouraged while
     the net is being hauled in, as the squid are clustered making it 
     an opportunistic time for the albatross to eat.

_S_o_u_r_c_e:

     This is from Hilborn and Mangel, _The Ecological Detective_,
     Princeton University Press, 1997. Original source of data is
     Bartle.

_E_x_a_m_p_l_e_s:

     data(bycatch)
     hauls = with(bycatch,rep(no.albatross,no.hauls))

