Age and growth of Brauer’s lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni (Family Myctophidae) in the Scotia Sea, Southern Ocean

Saunders, Ryan A. ORCID: https://orcid.org/0000-0002-1157-7222; Lourenço, Silvia; Vieira, Rui P.; Collins, Martin A. ORCID: https://orcid.org/0000-0001-7132-8650; Assis, Carlos A.; Xavier, Jose C. ORCID: https://orcid.org/0000-0002-9621-6660. 2020 Age and growth of Brauer’s lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni (Family Myctophidae) in the Scotia Sea, Southern Ocean. Journal of Fish Biology, 96 (2). 364-377. https://doi.org/10.1111/jfb.14206

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Text This is the peer reviewed version of the following article: Saunders et al (2019), Age and growth of Brauer's lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni (Family Myctophidae) in the Scotia Sea, Southern Ocean. J Fish Biol., which has been published in final form at doi:10.1111/jfb.14206. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Saunders_et_al-2019-Journal_of_Fish_Biology.pdf - Accepted Version Download (1MB) | Preview

Abstract/Summary

This study examines age and growth of Brauer's lanternfish Gymnoscopelus braueri and rhombic lanternfish Krefftichthys anderssoni from the Scotia Sea in the Southern Ocean, through the analysis of annual growth increments deposited on sagittal otoliths. Otolith pairs from 177 G. braueri and 118 K. anderssoni were collected in different seasons from the region between 2004 and 2009. Otolith‐edge analysis suggested a seasonal change in opaque and hyaline depositions, indicative of an annual growth pattern, although variation within the populations of both species was apparent. Age estimates varied from 1 to 6 years for G. braueri (40 to 139 mm standard length; LS) and from 0 to 2 years for K. anderssoni (26 to 70 mm LS). Length‐at‐age data were broadly consistent with population cohort parameters identified in concurrent length‐frequency data from the region for both species. The estimated values of von Bertalanffy growth curves for G. braueri were L∞ = 133.22 mm, k = 0.29 year–1 and t0 = –0.21 year and the values for K. anderssoni were L∞ = 68.60 mm, k = 0.71 year–1 and t0 = –0.49 years. There were no significant (P > 0.05) differences in growth between sexes for either species, suggesting that males and females have similar growth and development trajectories in the Scotia Sea. A positive allometric relationship between LS and wet mass was found for each species, as well as a significant (P <0.0001) linear relationship between otolith size and LS. Growth performance (Ф′) was similar between the two species and congruent with other myctophid species across the Southern Ocean. This study provides important parameters for future Southern Ocean ecosystem studies in a resource management context.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1111/jfb.14206
ISSN:	0022-1112
Additional Keywords:	Myctophidae; otoliths; morphology; body size; growth; Southern Ocean
Date made live:	20 Nov 2019 09:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/524602

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