Anguilla - Science topic

@all The density of silver eels (Anguilla anguilla) commonly used for trap-and-transport operations can vary depending on various factors such as local regulations, transportation methods, and the specific objectives of the operation. However, there are some general guidelines and practices followed in trap-and-transport initiatives.

It is important to note that specific guidelines and recommendations for silver eel trap-and-transport operations can differ between countries, regions, and even specific projects. It is advisable to consult local fisheries authorities, scientific literature, or experts in the field who have experience with trap-and-transport initiatives for silver eels. They can provide more precise and region-specific information on the commonly used densities for trap-and-transport operations with silver eels (A. anguilla).

The body shape of eels can vary depending on the species and life stage. However, in general, the ratio between body height/width and total or standard length in eels is likely to change as the eels grow and mature. Additionally, the specific ratio may vary among different populations and species of eels.

To determine the ratio between body height/width and total or standard length in very small eels, you can take measurements of individual eels using a caliper or ruler. For body height, measure the distance from the dorsal fin to the ventral surface of the eel at its widest point. For body width, measure the widest point of the eel perpendicular to the dorsal-ventral axis. Total length is the distance from the tip of the snout to the end of the tail, while standard length is the distance from the tip of the snout to the posterior end of the hypural plate.

Once you have these measurements, you can calculate the ratio between body height/width and total or standard length by dividing the body height or width by the corresponding length measurement. For example, the ratio between body height and total length would be calculated as:

body height/total length

Similarly, the ratio between body width and standard length would be calculated as:

body width/standard length

Keep in mind that the specific ratio may vary among different populations and species of eels, and that these ratios may change as the eels grow and mature. It may be useful to compare your measurements to published values for similar eel species or populations to determine if your measurements fall within the expected range.

Dear Robert Vincent , go through the below research gate link.

There will be dimensional and counts (meristic and morphometric) differences between most species and life stages, including sexes. This would be a valuable project for a careful student, starting with older eels and identifying the most probable differences, then moving back to younger forms.

Thanks Cedric! Yep, it seems it is a rather common feature, although they seem not every year green like this...Great picture by the way.

Cheers!

Hello Jasman,

Good doay. Thank you for the well wish. We wish you happiness and success too.

TQ

Dear Elizabeth,

I hope the attached papers would be helpful for you.

Shahram

Several eels were examined  in New Caledonia and other Pacific islands in a survey in 2003. No Anguillicola found. See attached paper.

The paper on link includes some useful information about your question.