No RNZAF Hudsons were on Fiji at the beginning of the war.
Here is the quote from the Official History:
"On the day Japan entered the war, the RNZAF's first-line aircraft comprised 36 Hudsons, 35 Vincents, and 2 Singapore flying boats. Of these, six Vincents and the Singapores were in Fiji. Second-line aircraft, mostly used by the training organisation and available for operational use in emergency, comprised the following:
62 Harvards
46 Hinds
143 Oxfords
26 Vildebeestes
30 Gordons
13 Vincents
221 Tiger Moths
7 Multi-engined civil types (including 3 in Fiji)
20 Miscellaneous light aircraft (including 1 in Fiji)
1 Walrus amphibian
Personnel strength on the same date was 10,500 in New Zealand and 450 in Fiji."
Later in the Chapter there is a situation for 20 February 1942. I quote:
"On 20 February the operational strength of the RNZAF was: No. 1 GR Squadron stationed at Whenuapai, with 8 + 4 Hudsons;1 No. 2 GR Squadron at Nelson with 8 + 3 Hudsons; No. 3 GR Squadron at Harewood with 10 + 5 Vincents; No. 7 GR Squadron, which had recently been formed at Waipapakauri, with 12 + 6 Vincents; No. 4 GR Squadron at Nandi, Fiji, with 6 + 3 Hudsons; No. 5 Squadron, also in Fiji, with 4 + 2 Vincents. In addition No. 5 Squadron had three of the Short Singapore flying boats which had been flown out from Malaya at the end of 1941.2 These were old and in poor condition, but could be used for operations if required. This gave a total first-line aircraft strength of 32 Hudsons and 39 Vincents.
The training organisation had the following second-line aircraft which could be available in case of emergency: 4 Vincents, 61 Oxfords, 45 Harvards, 9 Fairey Gordons and 15 Hawker Hinds, giving a total of 134."
The Hudsons were sent to Fiji in early February.
"The most vital link in the defensive chain was Fiji. If the enemy established himself there he could dominate the whole of the South Pacific and would be in a position to launch an attack against New Zealand. New Zealand had done what it could to reinforce the colony by sending all its anti-aircraft artillery and a fair proportion of the available Hudsons, but the defences in the first few weeks of 1942 were much too weak to withstand a major attack.
Early in February a detachment of six Hudsons from No. 2 Squadron was sent to Fiji temporarily to strengthen the air defences in the face of what appeared to be an imminent threat of attack. They arrived on 11 February and were attached to No. 4 Squadron at Nandi."
URL:
http://www.nzetc.org/tm/scholarly/tei-WH2AirF-c9.html and
http://www.nzetc.org/tm/scholarly/tei-WH2AirF-c10.html