Translator Disclaimer
1 April 2006 GROWTH RATE ESTIMATION OF HEXAPLEX (TRUNCULARIOPSIS) TRUNCULUS (GASTROPODA: MURICIDAE) BASED ON MARK/RECAPTURE EXPERIMENTS IN THE RIA FORMOSA LAGOON (ALGARVE COAST, SOUTHERN PORTUGAL)
Author Affiliations +
Abstract
This study reports growth rates estimates for Hexaplex (Trunculariopsis) trunculus (Gastropoda: Muricidae) from mark/recapture experiments carried out in the Ria Formosa lagoon (Algarve coast, southern Portugal). A total of 726 specimens (shell length and total weight ranging between 20.65–58.36 mm and 0.86–19.89 g, respectively) were marked with Dymo tape tags and released into a fish culture earth pond. During the marking process, no adverse effects on the whelks' health and behavior or immediate postmarking mortality were detected. Periodical recapture operations were undertaken using a traditional fishing gear designated locally as “wallet-line” and by hand gathering by scuba divers. A total of 170 whelks were caught, with a total of 216 recaptures (shell length and total weight ranging between 36.22–65.97 mm and 4.42–27.35 g, respectively), thus corresponding to a recapture rate of 29.8%. Despite the loss of one tag, all remaining tags were intact and easily readable. Marked individuals presented low monthly growth rates, in terms of shell length (1.0 mm/month or 2.3%/month), shell perimeter (2.0 mm/month or 3.1%/month) and total weight (0.7 g/month or 10.8%/month), which were highly variable between individuals and higher in smaller specimens. Data were used to estimate the von Bertalanffy growth parameters (length and weight) (K = 0.41, L∞ = 82.76, W∞ = 49.97 and t0 = −0.05). The growth rate of T. trunculus was compared with results obtained in similar studies with other gastropod species to evaluate its potential for molluscan aquaculture.
PAULO VASCONCELOS, MIGUEL B. GASPAR, ALEXANDRE M. PEREIRA and MARGARIDA CASTRO "GROWTH RATE ESTIMATION OF HEXAPLEX (TRUNCULARIOPSIS) TRUNCULUS (GASTROPODA: MURICIDAE) BASED ON MARK/RECAPTURE EXPERIMENTS IN THE RIA FORMOSA LAGOON (ALGARVE COAST, SOUTHERN PORTUGAL)," Journal of Shellfish Research 25(1), (1 April 2006). https://doi.org/10.2983/0730-8000(2006)25[249:GREOHT]2.0.CO;2
JOURNAL ARTICLE
8 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top