Relationship between somatic growth and otolith growth: a case study of the ornate jobfish Pristipomoides argyrogrammicus from the coast of Réunion (SW Indian Ocean)
|Author(s)||Mahe Kelig1, Aumond Yoann2, Rabhi Khalef1, Elleboode Romain1, Bellamy Elise3, Huet Jerome2, Gault M.4, Roos David2|
|Affiliation(s)||1 : IFREMER, Fisheries Lab, Sclerochronol Ctr, Boulogne Sur Mer, France.
2 : IFREMER, Le Port, La Reunion, France.
3 : IFREMER, Lab Environm Ressources Languedoc Roussillon, Sete, France.
4 : FRS Marine Lab, Aberdeen, Scotland.
|Source||African Journal Of Marine Science (1814-232X) (Natl Inquiry Services Centre Pty Ltd), 2017 , Vol. 39 , N. 2 , P. 145-151|
|WOS© Times Cited||3|
|Keyword(s)||age estimate, general linear model, Lutjanidae, modelled age, morphometric parameters, otolith morphometry, reading precision|
The ornate jobfish Pristipomoides argyrogrammicus Valenciennes 1832 occurs in the Indo-West Pacific Ocean, where it is harvested by small-scale coastal fisheries. Management of this species is hindered by lack of adequate biological data. We sampled a total of 113 individuals from the landings of local artisanal fishers on the island of Réunion (southwestern Indian Ocean), from March 2014 to March 2015. The relationships between two types of body length (total and standard length, cm) and total weight (g) were shown to be significant (p < 0.05). The length–weight relationship was described by a power function, with the scaling factor estimated to be 0.008 and the exponent 3.146. Age was determined using whole otoliths. The von Bertalanffy growth equation was estimated to be TLt = 30.68(1 – e–0.52(t)). Otolith morphometry variables (length, width and area) were significantly correlated with age estimates (p < 0.05). No significant difference in age estimates was observed between left and right otoliths used as predictors. Readings from observed age and the estimates from modelled age indicated relatively good agreement, suggesting the potential to use whole otoliths for age estimation.