A model of gillnet catch in relation to the catchable biomass, saturation, soak time and sampling period

摘要: Abstract We developed a new approach for evaluating gillnet catches. A model of catch was built to differentiate the effects saturation, fish activity and escapement from catch. The corrected catch, termed catchable biomass rate in text, is weight that can be caught within an hour by empty during period unitary activity. also observed soak time (2, 5, 8, 11 13 h) sampling (August vs. September) on Our results show saturation gillnets are important events occurring each use, thus violating assumption linear relationship between density. maximal capacity standardized benthic (45 m 2 area, 12 mesh sizes range 5 55 mm) assessed 11 kg, i.e., 245 kg 1000 m −2 gillnet. Sampling had only negligible effect recommend using instead uncorrected catches interpretation obtained data, especially when above 3 kg per (i.e., 67 kg ). created conversion table slide rule, which rates determined. method based different times. findings help better understand processes underlying improve interpretability reliability this comparing gears used assessing communities general.