Ideal Fish Observations
It is easy to photograph fish, but not so easy to get a photograph that can be identified.
We also value catch records, but remember many fish fade quickly after death. So when fishing, please try and take at least one picture while the fish is still alive.
Remember that one photograph may not be enough: take several from different angles and in different positions.
Many fish fade quickly after death: try and get at least one picture while it is still alive.
The important features are:
* a good side view of the fish.
You will need sufficient detail so that the number of scale rows can be counted and the lateral line and other features are clearly visible.
* a view of the dorsal and ventral fins in an erect pose.
(arrange your fish if you have it to hand, or wait for that perfect moment if it is swimming)
The fin formula is critical for identifying fish.
* a view of the pectoral and pelvic fins.
Preferably in spread position so that the spines can be clearly seen.
* notes: dont forget:
- size
- age
- sex
- depth
- time of day
- any behaviours you observe
More at http://ispot.org.za/Fishy_photos
No-one told the fish!
Live fish are very difficult to photograph in a way that fin and scale counts are possible. Add the problem of poor visibility most places, and congenitally skittish fish, and you are lucky to get anything. Still worth trying though and with more practice you get luckier.
Peter Southwood
Reef surveys and equipment design.
Southern Underwater Research Group (SURG)