Tagged fish releases and recaptures are not weighed but thier lengths are measured. Based on the allometric relationship between length and weight, this function uses length and weight measurements from commercial data in a log-linear model to estimate the weights of tagged fish from length data. A dataframe is returned with all the information input into length_data plus the estimated weights
est_fish_weight(length_weight_data, length_data)
| length_weight_data | is a four column dataframe with the CCAMLR ASD code,species code, length (cm) and weight (kg) |
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| length_data | is a six column dataframe with the CCAMLR ASD code,fishing season,cruise id, set id, species code, length (cm) |