#RED GROUPER FISH SOFTWARE#
#RED GROUPER FISH SERIES#

Journal of Statistical Software 67(1) īell-Tilcock M et al (2021) Advancing diet reconstruction in fish eye lenses. Akademiai Kaido, Budapest, p 267–281īates D, Mächler M, Bolker B, Walker SC (2015) Fitting linear fixed effect models using LME4. In: Petrov B, Caski F (eds) Second international smyposium on information theory. Īkaike H (1973) Information theory and an extension of the maximum likelihood principle. With this work, we demonstrate that eye-lens isotope value profiles can enhance fisheries datasets and may provide a method of recreating diet and movement histories for species without long-term biological information.Īdam T et al (2019) Joint modelling of multi-scale animal movement data using hierarchical hidden Markov models.

Stomach contents and δ 13C values together suggest that most red grouper move to nearshore waters at settlement, spend several months in shallow water with heavy benthic diet dependence, then slowly cross the continental shelf toward deeper water as they mature.

Profiles of δ 15N values indicate that trophic position increases with size following a logarithmic growth model, while stomach contents indicate a simultaneous increase in fish proportion in the diet. Eye-lens core isotope values suggest that successful individuals spend their larval period on the mid-to-outer continental shelf and locations do not vary substantially year-to-year. We combined a novel archive, δ 13C and δ 15N bulk values in sequential eye-lens laminae, with fishery-independent catch records and stomach contents for red grouper Epinephelus morio (Valenciennes 1828) from the eastern Gulf of Mexico, USA. By combining these disparate datasets, conclusions are strengthened through weight of evidence. Chemical archives, such as eye lenses, preserve information regarding several life stages for each individual.

#RED GROUPER FISH SERIES#

Most fishery datasets, such as catch records, length frequencies, and stomach contents, create a series of snapshots, with each captured fish representing a single timepoint during the lifespan. Many predatory marine fishes undergo ontogenetic diet and habitat shifts as they grow.

Red grouper fish