In fish species that show parental care, energy requirements are likely increased due to nest defense, cleaning, and/or oxygenation (e.g. tail fanning). A reduction in food intake may also occur during parenting. The condition of the parents can have significant consequences on the success of their offspring. For example, male smallmouth bass (Micropterus dolomieu) show parental care and when supplemented with additional food during this period, they show lower nest abandonment and improved reproductive success compared to males with no supplemental feeding (Zolderdo et al. 2016).
New Directions in Fish Nutrition Research
Current and future areas of fish nutrition research are focused on larval and broodstock nutrition, and the use of novel ingredients in fish diets to improve performance and/or sustainability. Novel techniques including genomics, proteomics, and metabolomics are being used to better define the requirements for nutrients and to better understand the gut microbiome to improve food digestibility, gut health, and fish performance. The increasing numbers of species that are being raised in commercial aquaculture systems and in different types of environments (e.g. recirculating low‐salinity rearing of marine species) will further expand our knowledge of the comparative nutrition of fish.
References
1 Adams, M.A., Johnson, P.B., and Hong‐Qi, Z. (1988). Chemical enhancement of feeding for the herbivorous fish Tilapia zillii. Aquaculture 72: 95–107.
2 Ahlgren, G., Vrede, T., and Goedkoop, W. (2009). Fatty acid ratios in freshwater fish, zooplankton and zoobenthos – are there specific optima? In: Lipids in Aquatic Ecosystems (eds. M.T. Arts, M.T. Brett and M. Kainz), 147–178. New York: Springer.
3 Ai, Q., Mai, K., Zhang, C. et al. (2004). Effects of dietary vitamin C on growth and immune response of Japanese seabass, Lateolabrax japonicus. Aquaculture 242: 489–500.
4 Almaida‐Pagán, P., Rubio, V., Mendiola, P. et al. (2006). Macronutrient selection through post‐ingestive signals in sharpsnout seabream fed gelatine capsules and challenged with protein dilution. Physiology and Behavior 88: 550–558.
5 Ashdown, D. and Violetta, G. (2004). Using garlic as an appetite stimulant in sand tiger sharks (Carcharias taurus). Drum and Croaker 35: 59–61.
6 Badwy, T.M.M., Ibrahim, E.M., and Zeinhom, M.M. (2008). Partial replacement of fishmeal with dried microalga (Chlorella spp. and Scenedesmus spp.) in Nile tilapia (Oreochromis niloticus) diets. Proceedings of the International Symposium on Tilapia in Aquaculture, Cairo, Egypt.
7 Baker, E.J., Clauss, M., and Clements, K.D. (2016). Selection and intake of algal species in butterfish (Odax pullus; Labridae). Marine Biology 163: 1–12.
8 Ballantyne, J.S. (2014). Membranes and metabolism. In: The Physiology of Fishes, 4e (eds. D.H. Evans, J.B. Claiborne and S. Currie), 81–148. Boca Raton, FL: CRC Press.
9 Bell, J.G. and Sargent, J.R. (2003). Arachidonic acid in aquaculture feeds: current status and future opportunities. Aquaculture 218: 491–499.
10 Ben‐Amotz, A., Tornabene, T.G., and Thomas, W.H. (1985). Chemical profile of selected species of microalgae with emphasis on lipids. Journal of Phycology 21: 72–81.
11 Bernard, J.B. and Allen, M.E. (2002). Feeding captive piscivorous animals: nutritional aspects of fish as food. AZA Nutrition Advisory Group Fact Sheet 005 [online]. https://nagonline.net/wp‐content/uploads/2014/01/NAG‐FS005‐97‐Fish‐JONI‐FEB‐24‐2002‐MODIFIED.pdf (accessed August 2017).
12 Bernard, J.B. and Dempsey, J.L. (1999). Quality control of feedstuffs: nutrient analyses. AZA Nutrition Advisory Group Handbook Fact Sheet 010 [online]. http://nagonline.net/wp‐content/uploads/2014/01/NAG‐FS010‐99‐Quality‐JONI‐FEB‐24‐2002‐MODIFIED.pdf (accessed June 2015 [August 2017]).
13 Blazer, V.S. and Wolke, R.E. (1984). The effects of α‐tocopherol on the immune responses and non‐specific resistance factors of rainbow trout (Salmo gairdneri Richardson). Aquaculture 37: 1–9.
14 Bone, Q. and Moore, R.H. (eds.) (2008). Biology of Fish, 3e. New York: Taylor and Francis.
15 Burr, G., Gatlin, D., and Ricke, S. (2005). Microbial ecology of the gastrointestinal tract of fish and the potential application of prebiotics and probiotics in finfish aquaculture. Journal of the World Aquaculture Society 36: 425–436.
16 Castillo, S. and Gatlin, D.M. (2015). Dietary supplementation of exogenous carbohydrase enzymes in fish nutrition: a review. Aquaculture 435: 286–292.
17 Chang, M. and Southgate, P.C. (2001). Effects of varying dietary fatty acid composition on growth and survival of seahorse, Hippocampus sp., juveniles. Aquarium Sciences and Conservation 3: 205–214.
18 Cho, C. and Bureau, D. (2001). A review of diet formulation strategies and feeding systems to reduce excretory and feed wastes in aquaculture. Aquaculture Research 32: 349–360.
19 Cho, Y.S., Douglas, S.E., Gallant, J.W. et al. (2007). Isolation and characterization of cDNA sequences of l‐gulono‐gamma‐lactone oxidase, a key enzyme for biosynthesis of ascorbic acid, from extant primitive fish groups. Comparative Biochemistry and Physiology Part B 147: 178–190.
20 Clements, K.D. and Raubenheiner, D. (2006). Feeding and nutrition. In: The Physiology of Fish, 3e (eds. D.H. Evans and J.B. Claiborne), 47–82. Gainesville, FL: CRC Press.
21 Cortés, E. and Gruber, S.H. (1992). Gastric evacuation in the young lemon shark, Negaprion brevirostris, under field conditions. Environmental Biology of Fishes 35: 205–212.
22 Crissey, S.D. (1998). Handling fish fed to fish‐eating animals: a manual of standard operating procedures [online]. http://www.aphis.usda.gov/animal_welfare/downloads/marine_mammals/mmfish.pdf (accessed August 2017).
23 Dalmo, R.A. and Bøgwald, J. (2008). Beta‐glucans as conductors of immune symphonies. Fish & Shellfish Immunology 25: 384–396.
24 Dalmo, R.A., Bøgwald, J., Ingebrigtsen, K., and Seljelid, R. (1996). The immunomodulatory effect of laminarian [β (1,3)‐d‐glucan] on Atlantic salmon, Salmo salar L., anterior kidney leucocytes after intraperitoneal, peroral and peranal administration. Journal of Fish Diseases 19: 449–457.
25 da Silva, R.F., Kitagawa, A., and Vázquez, F.J.S. (2016). Dietary self‐selection in fish: a new approach to studying fish nutrition and feeding behavior. Reviews in Fish Biology and Fisheries 26: 39–51.
26 Day, R.D., German, D.P., Manjakasy, J.M. et al. (2011). Enzymatic digestion in stomachless fish: how a simple gut accommodates both herbivory and carnivory. Journal of Comparative Physiology B 181: 603–613.
27 De, B.C., Meena, D., Behera, B. et al. (2014). Probiotics in fish and shellfish culture: immunomodulatory and ecophysiological responses. Fish Physiology and Biochemistry 40: 921–971.
28 Dhert, P., King, N., and O'Brien, E. (2014). Stand‐alone live food diets, an alternative to culture and enrichment diets for rotifers. Aquaculture 431: 59–64.
29 Dierenfeld, E.S., Katz, N., Pearson, J. et al. (1991). Retinol and α‐tocopherol concentrations in whole fish commonly fed in zoos and aquariums. Zoo Biology 10: 119–125.
30 Durve, V. and Lovell, R. (1982). Vitamin C and disease resistance in channel catfish (Ictalurus punctatus). Canadian Journal of Fisheries and Aquatic Sciences 39: 948–951.
31 Ericsson, C.D., Steffen, R., and Backer, H. (2002). Water disinfection for international and wilderness travelers. Clinical Infectious Diseases 34: 355–364.
32 Fernández‐Palacios, H., Norberg, B., Izquierdo, M., and Hamre, K. (2011). Effects of broodstock