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Behavior of some growth performance indexes for exploited Mediterranean hake

Sergio RAGONESE ; Institut za istraživanje obalnog morskog okoliša, IAMC‑CNR, Mazara del Vallo (TP), Italija
Sergio VITALE ; Institut za istraživanje obalnog morskog okoliša, IAMC‑CNR, Mazara del Vallo (TP), Italija
Salvatore MAZZOLA ; Institut za istraživanje obalnog morskog okoliša, IAMC‑CNR, Mazara del Vallo (TP), Italija
Elena PAGLIARINO ; Institut za agro-biologiju okoliša i šumarstvo, IBAF‑CNR, Monterotondo Scalo (RM), Italija
Marco L. BIANCHINI ; Institut za agro-biologiju okoliša i šumarstvo, IBAF‑CNR, Monterotondo Scalo (RM), Italija


Puni tekst: engleski pdf 2.812 Kb

str. 105-123

preuzimanja: 1.199

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Sažetak

In this paper, some life‑history estimates concerning the females of the Mediterranean hake Merluccius merluccius (L., 1758), i.e. the parameters of the von Bertalanffy growth function (L∞, K, and t0), the maximum-ever lengths (Lmax-e), and the lengths at full maturity (Lmst) were gathered from the pertinent literature and used to derive 5 growth performance indexes (K, φ’, RL=Lmst/ L∞, t50% and ω). The original datasets (n= 70) and the corresponding growth performance indexes were organized and analyzed by various geographical units (GFCM’s geographical sub‑area, GSA; GFCM’s statistical division, GD; and biological province, BP). The parameter distribution resulted to be normal only for the growth performance indexes K and RL; a significant relationship correlation was detected between K and t50%, between φ’ and ω, and between K and ω. The examination of the available historical data showed a scattered and unbalanced geographical distribution by GSA (e.g. 13 of 20 GSAs had less than 5 datasets each), a variability which was higher intra‑GSA than inter‑GSAs (as evidenced by the box‑plots) and no clear geographical trend. GD and BP presented similar patterns, with significant geographical effects only in the RL. Present results suggest that, even if geographical effects are expected, they are obscured by the uncertainty of the original parameters, especially those related to the von Bertalanffy growth function (vBGF). Consequently, growth performance indexes should be used (and interpreted) with caution.

Ključne riječi

Merluccius merluccius, Mediterranean hake, growth performance index, geographical partition, GSA, Mediterranean Sea

Hrčak ID:

89755

URI

https://hrcak.srce.hr/89755

Podaci na drugim jezicima: hrvatski

Posjeta: 1.637 *