The recent steps by AFMA to commence discussions on squid management issues and the recent formation of the SquidMAC underpin the increasing importance of squid as a fishery target. Australian fishery managers are in a unique position to obtain basic biological data on arrow squid before they are subject to considerable pressure. In the next several years managers will be faced with developing policy for sustained squid exploitation. However, currently there is scanty biological information with which to base sound scientific management decisions.
There are 3 main needs for the sustained development of the arrow squid fishery:

1) age and population dynamics
Dunning (1988) noted that a more thorough understanding of squid life histories and population dynamics is an essential prerequisite to responsible management of the existing and potential commercial fisheries for ommastrephid squids. There has been no ageing research on Australian arrow squid. We therefore don’t know how old they are, how fast they grow, what their form of growth is and when they hatch. The use of statolith ageing techniques has revolutionised our understanding of squid age, growth, population dynamics. We now know that life spans are measured in days not years (eg. Jackson & Choat 1992, Jackson 1994). Managers therefore face the unique problem of dealing with a completely new population each fishing season. Moreover, squid are known to show extreme plasticity in growth depending on the season of hatching (eg. Jackson et al. 1997).

2) maturity and reproduction
It is currently unclear where, when and how often arrow squid spawn. Furthermore, the effect that reproduction has on body condition or tissue integrity is unknown. Such information is relevant to the timing of fishing effort and condition of squid caught.

3) genetics
An important question is: what is the genetic structure of arrow squid in Australian waters? This is especially relevant now that arrow squid are managed as a Commonwealth fishery. Currently, we do not know if arrow squids form a single population or whether there are discrete stocks within Australian waters, and whether the population is static or migratory. Furthermore, is the arrow squid stock in Australia genetically distinct from arrow squid stock in the northern waters of New Zealand? Although the northern population of arrow squid in New Zealand is the same species found in Australia (Nototodarus gouldi) we have no information on whether there is mixing of the two populations. If the two countries share the same genetic pool than management considerations take on international significance. The genetic structure of squid is further clouded by their high incidence of cryptic speciation.

This project fits squarely within FRDC’s strategic priority of Program 1: Resources Sustainability. This work will therefore provide needed data for priority areas of knowledge of wild fish resources for sustainable management, general biology and genetics and stock definition (FRDC 1996).

References:

Dunning, M.C. (1988). Distribution and comparative life history studies of deepwater squid of the family Ommastrephidae in Australian waters. PhD. Thesis, University of Queensland.

Jackson, G.D. (1994). Application and future potential of statolith increment analysis in squids and sepioids. Can. J. Fish Aquat. Sci, 51: 2612-2625.

Jackson, G.D. & J.H. Choat (1992). Growth in tropical cephalopods, an analysis based on statolith microstructures. Can. J. Fish. Aquat. Sci., 49: 218-228.

Jackson, G.D., J. W. Forsythe, R.F. Hixon & R.T. Hanlon (1997). Age, growth and maturation of Lolliguncula brevis (Cephalopoda: Loliginidae) in the Northwestern Gulf of Mexico with a comparison of length-frequency vs. statolith age analysis. Can. J. Fish. Aquat. Sci., 54: 2907-2919.