Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

The life history of weedy seadragons, Phyllopteryx taeniolatus (Teleostei : Syngnathidae)

Kristy L. Forsgren A and Christopher G. Lowe B

A University of Washington, School of Aquatic and Fishery Sciences, 1122 NE Boat Street, Seattle, WA 98195, USA.

B California State University, Long Beach, Department of Biological Sciences, 1250 Bellflower Blvd, Long Beach, CA 90840, USA.

C Corresponding author. Email: klforsg@u.washington.edu

Marine and Freshwater Research 57(3) 313-322 http://dx.doi.org/10.1071/MF05094
Submitted: 24 May 2005  Accepted: 8 February 2006   Published: 27 April 2006

Abstract

The aim of this study was to provide a detailed description of the life history of weedy seadragons, Phyllopteryx taeniolatus. Weedy seadragon development was described based on morphological characters and categorised into four periods: incubation, larval, juvenile and sub-adult. Hatching occurred 35–42 days post-fertilisation, most hatchlings exhibited juvenile characteristics upon hatching or shortly thereafter. The von Bertalanffy growth parameters generated from weedy seadragon length-at-age data were L = 285 ± 3 mm standard length (SL; mean ± s.e.) and k = 2.20 ± 0.05 year-1. Females possessed a higher gonosomatic index (GSI; 1.25 ± 1.18%; mean ± s.d.) than males (0.34 ± 0.20%), which increased substantially for females over 230 mm in length. Mature female weedy seadragons (290 ± 32 mm SL) ovulated 110 ± 27 eggs per female per spawning. Additionally, three females produced more than one clutch per season. Male weedy seadragons (319 ± 9 mm SL) successfully incubated 91 ± 40 eggs per spawning event. In addition to improving our understanding of the life history of weedy seadragons, this information can be used to estimate population demography and develop management strategies.

Extra keywords: Australia, development, growth, reproduction, syngnathid.


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