Dietary protein requirement of juvenile Mexican Silverside (Menidia estor Jordan 1879), a stomachless zooplanktophagous fish

Abstract

A study was conducted in order to determine the protein requirements of juvenile Mexican silverside (Menidia estor). Seven isoenergetic diets (≈19.9 MJ kg−1) with dietary protein levels of 250, 300, 350, 400, 450, 500 and 550 g kg−1 were prepared as flakes using jack (Caranx sp.) and red snapper (Lutjanus sp.) fillets, tuna (Thunnus sp.) ovaries and California squid (Loligo sp.) as protein sources, and their effects on growth, survival and feed utilization of juvenile M. estor (69.24 ± 5.03 mg initial weight) were evaluated. Fish were fed by hand to apparent satiation, five times a day, for 8 weeks. Best growth and survival were obtained with diets with protein levels between 400 and 500 g kg−1, with no significant differences between them (P > 0.05). Specific growth rate and feed intake were also highest for these treatments (P < 0.05). There were no significant differences in feed conversion ratio and protein efficiency ratio between fish fed all the diets. Broken‐line analysis of individual weight gain against protein level showed a protein requirement of 409 g kg−1 for juveniles of M. estor.

The effect of protein levels on growth, postprandial excretion and tryptic activity of juvenile mulletMugil platanus(Günther)

“…Therefore, body composition is not an indicator of protein requirement for juvenile mullets, whereas growth, PER and ANPU reflected the protein requirement. Similar results have been found for juvenile red tailed tinfoil ( Barbodes altus , Günther) (Elangovan & Shim 1997) and juvenile Mexican silverside ( Menidia estor , Jordan 1879) (Martínez‐Palacios, Ríos‐Durán, Ambriz‐Cervantes, Jauncey & Ross 2007). On the other hand, body protein content increased when the dietary protein level was above the minimum protein requirement for the bydian perch ( Bidyanus bidyanus , Mitchell) (Yang, Liou & Liu 2002).…”

Dietary Protein Requirement of Juvenile Dianchi Golden‐line Barbell, Sinocyclocheilus grahami

“…The highest feed intake was found in fish fed the moderate protein group (39% protein). Similar results were observed in studies with Mexican silverside, Menidia estor (Martínez-Palacios et al 2007); silver barb, Puntius gonionotus (Mohanta et al 2008); black sea bream, Sparus macrocephalus (Zhang et al 2010); and marbled spinefoot rabbitfish, Siganus rivulatus (El-Dakar et al 2011). In addition, many studies showed that the feed intake was inversely related to dietary protein level (namely DP : DE ratio) (Siddiqui and Khan 2009;Akpιnar et al 2012).…”

Comparative studies on dietary protein requirements of juvenile and on-growing gibel carp (Carassius auratus gibelio) based on fishmeal-free diets

“…The FR was much lower in on-growing gibel carp (1.27-1.38) comparing with juvenile gibel carp (3.46-4.06), coincided to that small fish need to intake more nutrient to maintain body growth. FCR decreased with increasing dietary protein, high-protein diet demonstrated lower FCR which means better feed utilization (Shiau & Lan 1996;Alvarez-Gonz aez et al 2001;Yang et al 2002;Martinez-Palacios et al 2007;Ng et al 2008). Higher PRE in low-protein diets was consistent with Engin & Carter (2001), which suggested that the increasing of non-protein digestible energy in low-protein diets (isoenergetic diets) will increase nitrogen retention by decreasing nitrogen loss.…”