Decription of headers
columns 1 to 7 : Trawl haul parameters
columns 8 to 12: Fish parameters
columns 13 to 21: Otolith parameters. See otolith reading protocols in ICES (2010) for anchovy <https://doi.org/10.17895/ices.pub.19280525> and ICES (2011) for sardine <https://doi.org/10.17895/ices.pub.19280855>
===
 1. Date: Date of trawl hauls (character)
 2. NOSTA: Code of trawl hauls (character)
 3. LATDD: Latitude (decimal degree) of trawl hauls (numperic)
 4. LGDD: Longitude (decimal degree) of trawl hauls (numeric)
 5. Zone: Geographical strata (G1 to G4) of trawl hauls (character). See stratification in Petitgas et al. (2018) <https://doi.org/10.1016/j.pocean.2017.09.012> (character)
 6. Vposition: Position of trawl hauls in the water column (SURF: surface or mid-water, CLAS: close to bottom) (character)
 7. BTdepth.m: Bottom depth (m) at position of the trawl haul (-1: no data) (numeric)
 8. NOFISH: Code of the individual fishes at the station (character)
 9. Length.cm: Length of the fish (cm) (numeric)
10. Sex: Sex of the fish (M: male, F: female, -1: no data) (character)
11. Weight.gr: Weight of the fish (g) (numeric)
12. Maturity: Sexual maturity code of the fish (from 0 to 8, -1: no data) (numeric). See survey protocol in Doray et al. (2021) <https://doi.org/10.17895/ices.pub.7462>
13. Age (year): Number of winter rings (from 1 to 5, -1: no data) (numeric)
14. Reliability: Code indicating difficulty to assign age and interpret the otolith (0: good, 1: medium, 2: difficult, -1: no data) (numeric)
15. Edge: Code characterizing the edge of the otholith (H: hyalin, O: opaque, -1: no data) (character). "O" means growth has resumed after winter (the survey being in May).
16. R1.micron: Diameter of the first annual ring (microns) (numeric, -1 or voïd: no data). It represents growth before the first winter.
17. R2.micron: Diameter of the second annual ring (microns) (numeric, -1 or voïd: no data). It represents growth during ages 0 and 1.
18. R3.micron: Diameter of the third annual ring (microns) (numeric, -1 or voïd: no data). It represents growth during ages 0, 1 and 2.
19. R4.micron: Diameter of the fourth annual ring (microns) (numeric, -1 or voïd: no data). It represents growth during ages 0, 1, 2 and 3.
20. R5.micron: Diameter of the fifth annual ring (microns) (numeric, -1 or voïd: no data). It represents growth during ages 0, 1, 2, 3 and 4.
21. Rtot.micron: Total diameter of the otolith (microns), from edge to edge along the elongated axis. (numeric, -1: no data)