Care
The Green Gudgeon 'Goby' is a peaceful shoaling dartfish known from the relatively shallow waters of silty estuaries, lagoons, and seaward reefs. Here these pretty, elongate fish gather in large aggregations, hovering above the substrate amongst the current-swept waters to feed on zooplankton. A mated pair will occupy the same burrow, but if a large shoal is startled or when danger approaches, many individuals will hastily retreat or 'dart' into the same refuge together. The aquarium should be mature and offer plenty of swimming space. There should be ample nooks and crannies amongst the rockwork for the fish to hide in, as well as a fine sand substrate into which they can bury at night or when startled. As an especially gregarious species, it is important that a good sized group (of at least 5 individuals) are kept together, and these should be added to the aquarium simultaneously. Tankmates should be very peaceful as Green Gudgeon 'Gobies' are of a somewhat nervous disposition and will not cope well with boisterous companions; indeed, it is most important that they are not intimidated out of feeding so observe carefully. Anthias, blennies, cardinalfish, dragonets, firefish, gobies, and grammas would all work well. Wherever possible, site the tank in an area that does not receive constant foot traffic, and ensure that all illumination switches on and off gradually rather than suddenly, as these fish are so easily spooked. Due to their fast metabolism (and consequent requirement of food offerings several times per day), decent filtration and areas of brisk water movement are essential. Ensure that the tank has tight fitting coverslides and no escape holes where equipment feeds into the aquarium, as these fish are expert jumpers. Closely resembles
P. heteropterus but lacks the dark mark on the tail. May also be seen on sale as Blue Gudgeon 'Goby'.
Feeding
In the wild, this species is constantly on the lookout for food, taking zooplankton from the water column. Due to their fast metabolism, they require feeding in small amounts several times per day (i.e. at least 4 times) if they are to maintain good health. Offer a variety of fine meaty foodstuffs such as Mysis shrimp, vitamin-enriched brineshrimp, finely chopped krill/prawns etc in addition to zooplankton preparations (containing copepods and rotifers) which are often available in either frozen or refrigerated forms.
Breeding
This species has spawned in the home aquarium, but to date, no-one has successfully reared the young. Keeping a large sized group of adults will greaten the chances of having both sexes, and a compatible pair may naturally form. When ready to breed, the male will display his fins and 'mouth' at the female, before swimming parallel with her in a courtship dance. A mass of yellow eggs are deposited in a crevice, with the adults guarding them until they hatch. The resultant fry are minuscule and very sensitive to environmental fluctuations.
