Relationship between BP (Baculovirus penaei) and energy reserves in larval and postlarval Pacific white shrimp Penaeus vannamei

Abstract

ABSTRACT:The relationship between energy reserves of the penaeid shrimp Penaeus vannamei and Baculoviruspenaei, or BP, were investigated in a series of experiments using mysis stage or early postlarval shrimp. Pre-exposure and post-exposure levels of protein and triacylgycerol (TAG) were determined. The effect of pre-exposure protein and TAG levels on susceptibility to BP infections was also investigated by starving a group of shrimp immediately prior to BP exposure. There was no consistent relationship between either pre-exposure or post-exposure protein levels and the percent of shrimp developing patent BP infections. There was, however, a significant positive correlation between TAG levels immediately prior to viral exposure and prevalence of infection 72 h later. Experimental reduction of TAG reserves prior to BP exposure delayed the development of a patent infection. In some, but not all, experiments there was a significant reduction in TAG levels of infected compared with uninfected shrimp 72 h post-exposure. The effect of patent BP infections on host TAG levels was subordinate to fluctuations in TAG content associated with the ontogeny of the hepatopancreas. Results of this study support histological observations that shrimp lipid levels can be altered by baculovirus infections. Furthermore, high levels of energy reserves in the form of TAG are associated with increased susceptibility to BP infection in larval and postlarval shrimp.

Effects of Limited Dissolved Oxygen Supply on the Growth and Energy Allocation of Juvenile Chinese Shrimp, Fenneropenaeus chinensis

“…In the current experiment, F. chinensis showed no different response to DO changes in wet weight gain when DO was above 3.10 mg/L, but refer to no difference in dry weight gain, DO should be above 4.13 mg/L, which was close to the corresponding levels (at or above 4 mg/L) for P. aztecus and P. setiferus (Renaud 1986). The difference between the effects of low DO on wet weight and dry weight gain indicated that deficient oxygen supply might cause the rising of body moisture content like other stresses (Wang and Stickle 1988; Stuck et al 1996a, 1996b; Lim 1997). So the growth of juvenile F. chinensis would not be affected by DO above 4.13 mg/L.…”

Mass mortalities of Pacific oysters Crassostrea gigas reflect infectious diseases and vary with farming practices in the Mediterranean Thau lagoon, France

“…A similar result was found in a previous study where the TAG concentrations in sea scallop larvae treated with an antibiotic were higher compared with scallops exposed to Vibrio spp., suggesting that antibiotic treatment enhanced the condition of sea scallops by reducing the amount of energy allocated to defence (Pernet et al 2006). Viral and bacterial infections also reduce the lipid content in several crustacean species (Stuck & Overstreet 1994, Stuck et al 1996, Floreto et al 2000. It is therefore possible that a high level of TAG in oysters could enhance their resistance to pathogen-related mortality events.…”

Metabolic reprogramming of Helicoverpa armigera larvae by HearNPV facilitates viral replication and host immune suppression

“…In analogous work, Kang et al (2011) found that starvation of Bombyx mori (L.) and Heliothis virescens (F.) larvae early in the process of baculovirus infection diminished pathogenesis and delayed mortality. Lipid reserves, another important store of energy, are positively correlated with susceptibility of post‐larval Pacific white shrimp to Baculovirus penaei (Stuck et al, 1996). Bracoviruses have also demonstrated the ability to manipulate host lipid metabolism for the benefit of the developing endoparasitoids with which they are symbiotic (Wang, Wu, et al, 2021).…”