Fishes near Iquitos

[bekateen]

The lanceolata are finally starting to macho up!

These R. lanceolata have now spawned: Rio Itaya black Rineloricaria lanceolata spawned

[bekateen]

What I just got home with are:

• 6 Ancistrus sp. Rio Nanay (one male 14cm SL and over 18cm TL... huge!)

Cheers, Eric

After reading a Facebook post by Junior Chuctaya and a reply from Emanuel Neuhaus, I learned that this Peruvian Ancistrus is part of a study and as of now it's being investigated as Ancistrus cf_leucostictus. Note: I realize that this FaceBook post may not be visible, so I've screencaptured it and attached it here:

Facebook post (in case it's no longer visible)

These Peruvian fish are far-flung from the type locality of Ancistrus leucostictus sensu stricto, and the SL of the Peruvian fish is at least 4 cm longer than the max SL recorded for the Guyana populations. Molecular data is going to be important to unite or split the Peru and Guyana populations.

• As a side comment on SL, there was a 2019 Zootaxa review of this species by De Souza et al. which has a photo of Ancistrus leucostictus AUM 48162. The photo's caption reads "185.3 mm SL" for the specimen shown. But if you use the 1 cm scale bar of the photo to estimate the same specimen's SL, you obtain about 85 mm SL; and in the species text narrative (page 24, inside the "Specimens examined" paragraph), this same museum sample contains no specimen larger than 87.8 mm SL. I think it's pretty clear that the "185.3 mm SL" is a typographical error. So when I say Peruvian fish are 4 cm larger than the described populations, I'm going off the SL of my big male at about 140 mm SL as shown in my photo here.

I've had some of these for 16 months now and I'm kinda surprised they haven't yet bred. Patience....

Cheers, Eric

[sturiosoma]

We returned to the same spot off the Nanay this afternoon. Hugely successful... but you'll have to wait till at least tomorrow for pictures. Among today's catch:

• one big Limatulichthys griseus (also about 8-10 cm SL) and 2 or 3 smaller individuals.

Wow, did I underestimate this! 15.06 cm SL!

Eric when you go on your collecting trips do you ever take note of plants and trees growing in and around collection points most folks just check water parameters.

Jeanne

[bekateen]

Hi Jeanne,

I have a few photos of the area, but I don't take close-up photos or document identities of the plants along the shorelines. In the streams where I collected, there are essentially no submerged plants. The stream beds are fine sand, leaf litter and submerged logs and branches. The shorelines are either bare mud because of human activity, or they are overgrown with long terrestrial grasses dangling into the water or in some cases there are floating mats of plants (I guess technically those are aquatic plants).

In the streams I've sampled, pH is between 4-6 and TDS is often down around 15-30ppm.

Cheers, Eric

[bekateen]

After reading a Facebook post by Junior Chuctaya and a reply from Emanuel Neuhaus, I learned that this Peruvian Ancistrus is part of a study and as of now it's being investigated as Ancistrus cf_leucostictus.

These Peruvian fish are far-flung from the type locality of Ancistrus leucostictus sensu stricto, and the SL of the Peruvian fish is at least 4 cm longer than the max SL recorded for the Guyana populations. Molecular data is going to be important to unite or split the Peru and Guyana populations.

I've had some of these for 16 months now and I'm kinda surprised they haven't yet bred. Patience....

Cheers, Eric

These Ancistrus are now spawned. Details will be posted here: https://www.planetcatfish.com/forum/vie ... hp?t=51736