Humoral immune responses of channel catfish (Ictalurus punctatus) fry and fingerlings exposed toEdwardsiella ictaluri

Ontogeny of IgM-producing cells in the mandarin fish Siniperca chuatsi identified by in situ hybridisation

“…In spotted wolffish, plasma cells emerged first in the head kidney between 1 and 4 weeks post-hatching (wph) , 3 wph in head kidney and thymus of zebrafish, Danio rerio (Lam et al, 2004). In channel catfish, Ig-positive cells were first detected on 7, 10 and 14 dph in anterior renal haematopoietic tissue, thymus and spleen (Petrie-Hanson and Ainsworth, 1999). However, in some marine fish, such as Atlantic cod, the immune system develops during the period of metamorphosis (Schrøder et al, 1998b).…”

Fate of fluorescent microspheres in developing Ictalurus punctatus following prolonged immersion

“…Petrie-Hanson and Ainsworth [6] observed that channel catfish fry vaccinated at 21-dph were the youngest age group to demonstrate a specific antibody response. The results of antigen exclusion or a lack of ability in antigen uptake observed in the present study before 3-wph coincides with these findings.…”

Cholera toxin has adjuvant properties in channel catfish when injected intraperitoneally

“…The fish used in the present studies averaged 11·22 g, which might explain the limited antibody responses detected. However, a recent study (Petrie-Hanson & Ainsworth, 1999) demonstrated immune competence in channel catfish following bath vaccination at 3 weeks of age (average fish weight 0·8 0·05 g). The limited systemic antibody response following p.o.…”

“…Robohm & Koch (1995) showed a decrease of antigen uptake in oesophageally plugged fish during immersion vaccinations, indicating that the oral route of entry is important during this vaccination route. In addition, Petrie-Hanson & Ainsworth (1999) have recently shown that bath vaccination of channel catfish must be performed after maturation of the immune system in order to result in antibody production, indicating that timing of these vaccines is critical.…”