Navigation Links
Naïve fish: Easy targets for spear fishers
Date:11/13/2012

Big fish that have grown up in marine reserves don't seem to know enough to avoid fishers armed with spear guns waiting outside the reserve.

The latest research by an Australian team working in the Philippines into the effects of marine reserves has found there is an unexpected windfall awaiting fishers who obey the rules and respect reserve boundaries in the form of big, innocent fish wandering out of the reserve.

"There are plenty of reports of fish, both adults and juveniles, moving out of reserves and into the surrounding sea. Having grown up in an area where they were protected from hunting, we wondered how nave they would be with regard to avoiding danger from humans," says Fraser Januchowski-Hartley of the ARC Centre of Excellence for Coral Reef Studies.

The answer is: pretty nave. "Educated fish normally turn tail and flee when a diver armed with a spear gun approaches within firing range of them. The typical flight distance is usually just over four metres," he explains.

"However in our studies of marine reserves in the Philippines, Vanuatu and Papua New Guinea, where spearfishing remains a major way of harvesting table fish, we discovered that reserve-reared fish were much less wary and allowed people to get much closer.

"The fish are literally more catchable."

The team studied fish across the boundaries of marine reserves from 200m inside the protected areas to 200m into the fished areas. They used underwater markers and measuring tapes to measure the 'flight initiation distance' of fish targeted locally by spearfishers. This indicates how close a skin diver can approach to a large fish before it decides to turn and flee.

They found that target fish living in fished areas were typically much warier of divers, and took flight at distances a metre or two further away, than ones living within the reserve.

They also established that the 'naivete radius', whereby more catchable fishes spill out of the marine reserves extended for at least 150 metres from the boundary.

The team's findings suggest that fishers are more likely to catch fish that stray out of the reserve, and so improve the local fish harvest. This may help fishers become more supportive of marine reserves.

"In these parts of the oceans, spear fishing is still very much about survival for humans and putting food on the family table so it is important that local fishers feel they are deriving some benefit from having a local area that is closed to fishing, or they may not respect it," says Dr Nick Graham, a co-author on the study.

"This information is also useful in traditional reserves where fishing is taboo most of the time, but then they are opened for fishing by village elders just a few days a year.

"On the face of it, this work suggests that marine reserves can play an important role in putting more fish on the table of local communities in these tropical locations as well as conserving overall fish stocks and replenishing those outside the reserve," Januchowski-Hartley says.


'/>"/>

Contact: Nick Graham
Nick.Graham@jcu.edu.au
61-074-781-6291
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

Related biology news :

1. The EU underpays Madagascar for access to fish: UBC research
2. Cichlid fish: How does the swim bladder affect hearing?
3. Crestor Delivers Latest LDL-C Targets in High-Risk Patients at Lower Doses than Other Statins
4. Scripps Research Institute scientists find promising vaccine targets on hepatitis C virus
5. Unique adaptations to a symbiotic lifestyle reveal novel targets for aphid insecticides
6. Its a trap! New laboratory technique captures microRNA targets
7. Blocking DNA: HDAC inhibitor targets triple negative breast cancer
8. Wayne State University researchers program targets safer river fishing, anglers health
9. Scientists use worms to unearth cancer drug targets
10. New potential targets discovered for treating squamous cell lung cancers
11. Why letting salmon escape could benefit bears and fishers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2017)... According to a new market research report "Consumer IAM Market by Solution ... Authentication Type, Deployment Mode, Vertical, and Region - Global Forecast to 2022", ... 14.30 Billion in 2017 to USD 31.75 Billion by 2022, at a ... ... MarketsandMarkets Logo ...
(Date:4/11/2017)... 11, 2017 No two people are ... the New York University Tandon School of Engineering ... found that partial similarities between prints are common ... mobile phones and other electronic devices can be ... vulnerability lies in the fact that fingerprint-based authentication ...
(Date:4/5/2017)... , April 5, 2017  The Allen Institute for ... Cell Explorer: a one-of-a-kind portal and dynamic digital window ... imaging data, the first application of deep learning to ... stem cell lines and a growing suite of powerful ... for these and future publicly available resources created and ...
Breaking Biology News(10 mins):
(Date:5/18/2017)... Malden, Mass. (PRWEB) , ... May 18, 2017 ... ... completed the procedure on April 28, 2017 at the Prince Of Wales Private ... degenerative cervical disc at level C6-C7. The patient failed conservative treatments prior to ...
(Date:5/18/2017)... ... May 16, 2017 , ... Clinical Supplies Management (“CSM”), a Great ... company continues to grow. CSM has doubled in size over the past six ... aggressive growth strategy. , Roger Gasper joins CSM as Chief Financial Officer. Roger ...
(Date:5/18/2017)... ... May 17, 2017 , ... ... enhances its scientific power by providing investigators access to a high-profile scientific ... join the scientific advisory board. “We are committed to offering superior services ...
(Date:5/18/2017)... SANTA BARBARA, CALIFORNIA (PRWEB) , ... May 17, ... ... risk management, technological innovation and business process optimization firm for the life sciences ... the Chairman of the UDIs and Traceability for Medical Devices conference in Brussels, ...
Breaking Biology Technology: