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View Resource Baywide Monitoring of Key Fishery Species in Seagrass Beds Sub-Program Progress Report No. 6 (November 2010) Neil Hutchinson & Greg Jenkins January 2011 Fisheries Victoria Technical Report Series No. 125 If you would like to receive this Copyright The State of Victoria, Department of information/publication in an Primary Industries, 2011. accessible format (such as large This publication is copyright. No part may be reproduced by any process except in accordance print or audio) please call the with the provisions of the Copyright Act 1968. Customer Service Centre on: Authorised by the Victorian Government, GPO 136 186, TTY: 1800 122 969, Box 4440, Melbourne, VIC 3001 or email Printed by Fisheries Victoria, Queenscliff, [email protected] Victoria Published: Fisheries Victoria Hutchinson, N. and Jenkins, G. (2011). Baywide Department of Primary Monitoring of Key Fishery Species in Seagrass Industries, Queenscliff Centre Beds Sub-Program. Progress Report No. 6 PO Box 114, Queenscliff, Victoria (November 2010). Fisheries Victoria Technical 3225 Australia. Report Series No. 125, January 2011. Fisheries Victoria, Department of Primary Industries, Queenscliff, Victoria, Australia. 10 pp. General disclaimer This publication may be of assistance to you but the State of Victoria and its employees do not ISSN 1835-4785 guarantee that the publication is without flaw of ISBN 978-1-74264-699-2 any kind or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on any information in this publication. Baywide Monitoring of Key Fishery Species in Seagrass Beds Progress Report #6 ii Table of Contents List of Tables ............................................................................................................................................................ iv List of Figures ........................................................................................................................................................... iv Introduction............................................................................................................ 1 This Report..................................................................................................................................................................1 Materials and Methods......................................................................................... 2 Field and laboratory methods..................................................................................................................................2 Results and Discussion ........................................................................................ 3 Species Richness ........................................................................................................................................................3 Abundance ..................................................................................................................................................................3 Comparison with previous surveys........................................................................................................................3 Conclusions.................................................................................................................................................................4 References ............................................................................................................... 5 Appendix 1 Data Plots.......................................................................................... 6 Appendix 2............................................................................................................ 10 Raw data ....................................................................................................................................................................10 Data Files...................................................................................................................................................................10 Baywide Monitoring of Key Fishery Species in Seagrass Beds Progress Report #6 iii List of Tables Table 1. Average abundance (No. haul -1; four hauls per site) of fish and squid sampled in deep and shallow seagrass beds at each site (Blairgowrie, Mud Islands and St Leonards) in November 2010 and total number of each species collected (species names from Gomon et al. (2008) and Museum of Victoria). Species not found during previous sampling events are marked in bold. ............................... 6 List of Figures Figure 1. CDBMP sampling sites for monitoring key fishery species in seagrass beds sub-program. .......... 2 Figure 2. Average (+SE) species richness recorded in seagrass beds at each site in PPB from April 2008 to November 2010................................................................................................................................................... 8 Figure 3. Average (+SE) fish abundance (totalled for all species) recorded in seagrass beds at each site in PPB from April 2008 to November 2010 (NB scale change between graphs)............................................9 Baywide Monitoring of Key Fishery Species in Seagrass Beds Progress Report #6 iv Introduction The purpose of the Monitoring Key Fishery Species in Seagrass Beds Sub-Program of the This Report Channel Deepening Baywide Monitoring This report summarises preliminary, qualitative Programs (CDBMP) for Port Phillip Bay (PPB) is results of the third spring survey (November to improve the understanding of the fish species 2010) for the sub-program. using seagrass beds in the Bay. This sub- Length measurements recorded during program is described in the CDBMP Detailed November 2010, together with quantitative, Design: CDP_ENV_MD_018 Rev 2.1 (PoMC statistically analysed results for the survey, will 2009). be reported in the upcoming Milestone Report The objective is to collect data on the types and No. 6. abundance of fish in shallow and deeper seagrass beds that will fill existing knowledge gaps and assist in understanding the significance of any observed changes in seagrass habitat for these fish. Surveys are undertaken to compare the distribution and abundance of fish in shallow (< 1 m) and deeper (2–8 m) seagrass beds in three areas of PPB. These surveys are conducted in spring (November) and autumn (April) each year between 2008 and 2011. The autumn 2008, spring 2008, autumn 2009, spring 2009 and autumn 2010 surveys were reported in Smith et al. (2008), Hutchinson et al. (2009a; b; 2010) and Hutchinson and Jenkins (2010). Baywide Monitoring of Key Fishery Species in Seagrass Beds Progress Report #6 1 Materials and Methods three sites: Blairgowrie, Mud Islands and St Field and laboratory methods Leonards (Figure 1). Samples were collected Field and laboratory methods utilised in the between 4 November and 29 November 2010. present study are described by Smith et al. (2008) and PoMC (PoMC 2009). There were no significant field events observed. No QA/QC issues were recorded during this During the spring 2010 study period (this report), reporting period. fish were sampled in shallow (< 1 m) and deeper (2–8 m) seagrass, Heterozostera nigricaulis , beds at Figure 1. CDBMP sampling sites for monitoring key fishery species in seagrass beds sub-program. Baywide Monitoring of Key Fishery Species in Seagrass Beds Progress Report #6 2 Results and Discussion A total of 39 fish species (37 finfish, one ray and spotted pipefish and wide-body pipefish one squid) from 21 families (19 families for occurred in the greatest numbers. finfish, one family for rays and one family for The abundance of fish (total for all sites) was squid) were sampled for all sites. Summary data higher in shallow seagrass (1594 fish) than deep for species richness and abundance at all sites for seagrass (209 fish). Shallow seagrass was the reporting period are provided in Appendix 1 dominated by silver fish (1079 fish), spotted (Table 1). Data files for this reporting period are pipefish (135 fish) and wide-body pipefish (96 summarised in Appendix 2. fish). Deep seagrass was dominated by a range of Fish species sampled in November 2010 were species including bridled leatherjacket (145 fish), indicative of those collected in and around spotted pipefish (33 fish) and wide-body pipefish seagrass beds in previous surveys (Smith et al. (six fish). 2008; Hutchinson et al. 2009a; b; Hutchinson and Jenkins 2010; Hutchinson et al. 2010) and in Comparison with previous previous studies of PPB (Jenkins et al. 1997; Hindell et al. 2001). Silver fish (atherinids), surveys spotted pipefish and wide-body pipefish During this survey, one species of fish was (syngnathids), and bridled leatherjacket sampled that was not found during the previous (monocanthids) were the dominant species. surveys: • short-tassel weedfish ( Heteroclinus flavescens ; Species Richness one fish) Species richness (i.e. the number of species In contrast, 39 species of fish found in one or collected) was highest at Blairgowrie, with: more of previous surveys were not found in this • 28 species of finfish and one species of squid survey. The majority of these species were rare, at Blairgowrie with relatively few individuals collected at any • 18 species of finfish and one species of squid time. at Mud Islands In shallow seagrass hauls at Mud Islands there • 19 species of finfish and one species of ray at was a decrease in average species
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