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Assessing the effectiveness of cuttlefish traps based on lure prevalence, survival and maturity status

Citation

Ganias, Kostas (2020), Assessing the effectiveness of cuttlefish traps based on lure prevalence, survival and maturity status , Dryad, Dataset, https://doi.org/10.5061/dryad.ghx3ffbmk

Abstract

Trap fishing is viewed as a low impact and fuel-efficient capture technique that is drawing increasing attention. However, due to their low capture efficiency fisheries sustainability may only be attained through improving profitability of these gears. The present study attempted to provide the necessary background for the establishment of a cuttlefish trap fishery in Thermaikos gulf (E. Mediterranean), a heavily fished area by gears of questionable sustainability such as the trammel nets. This task required the implementation of gear types and fishing operation techniques from other fishing areas. However, the use of empty traps or traps equipped with an artificial spawning substrate like branches of shrubs proved ineffective. Cuttlefish catches were only successful by baiting the cuttlefish trap with a female lure which entices males to enter the trap. We hereby propose that the method of choice is determined by the physical characteristics of the fishing-ground area. Other important factors including the shape and size of trap entrances and soak time are also investigated in an attempt to address crucial knowledge gaps and identify what the optimum fishing protocol and trap technical characteristics are for this potentially new métier for the Greek small-scale fisheries.

Usage Notes

A. trap_fishing_db.xlsx

-Sheet 'HAULS': containts all the information on hauls (POTxxx) including sampling dates, coordinates, temperature, catch biomass, discarded biomass and expenses

-Sheet 'SEPIA': contains all biometric measurements of cuttlefish including total lenght (TL), mantle lenght (ML), fin lenght (FL), total weight (TW), eviscerated weight (EW), body conidition, sex, gonad weight (GW) and maturity stage (MAT STAGE)

B. POT.PERFORMANCE.xlsx

Contains the main data used for the paper:

-the type of lure (LURE_TYPE), i.e. whether a cuttlefish was used (C), a branch of shrub (B) or whether the trap was left empty (L or NA)

-The lure mantle length (ML) and maturity (LURE_MAT: 1 mature, 0 immature)

-The lure status: R=remained; D: died: E: escaped

-The fishing duration

-The prevalence and intenstity of cuttlefish

-The prevalence and intenstity of other species (FISH_PREV and FISH_INT)

-The type of other species

-The type of trap entrance (ENTR)