@article{fdi:010035685,
  title = {{A}mphidromous fish school migration revealed by combining fixed sonar monitoring (horizontal beaming) with fishing data},
  author = {{B}rehmer, {P}atrice and {D}o {C}hi, {T}. and {M}ouillot, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}oastal and estuarine environments are particularly productive ecological systems and can provide protein and nutrient exports to adjacent marine ecosystems. {I}n spite of this, studies of fish school migration patterns between lagoons and the sea are lacking. {I}n 1999, fish samplings combining fishing and acoustic sonar field data collection were performed in two shallow water channel lagoons to monitor fish school diel migration (lagoon-sea). {L}agoon fish assemblages included 15 species and 10 families. {T}he estimated abundances and the fishes' swimming characteristics permit those detected by sonar to be selected according to 3 criteria. {D}irect sampling by cast net confirmed that {D}icentrarchus labrax schools were present during the autumn migration period. {I}n situ horizontal sonar observation in shallow water bodies constitutes a powerful tool for the {S}tudy of fish behaviour. {F}ish school migration within the range of values recorded was not affected by current velocity (maximum 0.83 m/s). {N}o relationships among school shape, surface area or migratory direction were found. {T}he amphidromous schools were small (0.3 to 15 in 2) and observed mainly at night. {M}igratory behaviour appeared to be determined to some extent by fluctuations in lagoon salinity and temperature. {C}onsistent with the 'multi-transit' hypothesis, which states that schools pass several times in front of the sonar transducer before moving toward or away from the lagoon, the net flow of fish was less than that predicted by the sonar methodology. {T}hus the multi-transit behaviour hypothesis should be considered when interpreting fish {P}opulation transfer data gathered with acoustic methods using a single transducer in rivers, estuaries, or channels. {I}n addition, the exclusive use of echosounder {C}ould generate major biomass underestimation when the fish are grouped in schools. (c) 2006 {E}lsevier {B}.{V}. {A}ll rights reserved.},
  keywords = {amphidromous ; fish school ; in situ behaviour ; lagoon channel ; sonar horizontal beaming},
  booktitle = {},
  journal = {{J}ournal of {E}xperimental {M}arine {B}iology and {E}cology},
  volume = {334},
  numero = {1},
  pages = {139--150},
  ISSN = {0022-0981},
  year = {2006},
  DOI = {10.1016/j.jembe.2006.01.017},
  URL = {https://www.documentation.ird.fr/hor/fdi:010035685},
}