Here are a few more Wang studies. There are some great articles by Neff on the subject where they did extensive diving and observation over years, there are also great genetic articles on Centrarchidae genetics by Bolnick and Near - TEMPO OF HYBRID INVIABILITY IN CENTRARCHID FISHES (TELEOSTEI: CENTRARCHIDAE), plus much more.

Inherent Growth Capacity and Social Costs of Bluegill and Hybrids of Bluegill and Green Sunfish: Which Fish Really Grows Faster?
R. S. Hayward & H. P. Wang
Abstract
There is interest in knowing whether the bluegill Lepomis macrochirus or a hybrid of bluegill and green sunfish L. cyanellus (F1: male bluegill × female green sunfish; hereafter called B × G hybrids) can be grown faster to food market size (225–340 g). The predominant view is that the hybrid grows faster. In this study, the inherent growth capacities (IGCs) of age-1 bluegills and B × G hybrids were determined over four successive 25-d periods (May–August 2000) by holding them individually at 22°C and feeding them to apparent satiation three times daily. The hybrid's IGC was greater during period 1 but fell to only 33% of the bluegill's over the three subsequent periods; the consumption and gross growth efficiency (GGE) of the hybrid showed similar declining patterns. The growth-in-weight trajectory of bluegills crossed above that of the hybrids at about 30 g. Gonadosomatic index values suggested that hybrid growth rates declined below those of the bluegill because the former invested more energy in gonads as age-1 fish. A follow-up study, conducted under similar conditions from August 2000 to March 2001, found that individually held age-1 bluegills starting at 30 g reached more than 100 g in 200 d, gaining nearly twice the weight achieved by hybrids of similar starting weight that were reared in parallel. The costs of social interaction in terms of reduced consumption, growth, and GGE were also quantified for bluegills and hybrids by comparing individually held fish with group-held fish over periods 1–3. Social costs reduced the growth rates of grouped bluegills more than those of grouped hybrids over the 75-d period. Our findings indicate that while the IGC was higher for the hybrids as early age-1 fish, the long-term IGC (e.g., to food market weights) is higher for bluegills; however, this result may be obscured, in part, by the bluegill's higher social costs. Reduction of bluegill social costs in certain culture settings should result in growth rates that approach their higher IGC. Also, social costs varied in response to short-term shifts in the IGCs of both fishes, indicating a previously unknown influence on social interactions in fishes.

Use of Compensatory Growth to Double Hybrid Sunfish Growth Rates
Robert S. Hayward , Douglas B. Noltie & Ning Wang

Abstract
We studied the use of compensatory growth (CG) to grow fish larger than control fish that were fed every day without restriction. Five treatment groups of 10 juvenile hybrid sunfish (F1 hybrid of female green sunfish Lepomis cyanellus × male bluegill L. niacrochirus) received repeating cycles of no feeding and refeeding; fixed no-feed periods of either 2, 4, 6, 10, or 14 d distinguished the treatment groups. No-feed periods elicited the CG state and were immediately followed by days of ad libitum refeeding. Refeeding periods within each treatment group (D2, D4, D6, D 10, or D14) were continued until mean daily food consumption by fish no longer exceeded that of controls fed ad libitum every day (i.e., ad libitum refeeding was continued for as long as hyperphagia persisted, then another no-feed period began). Fish in two groups, D2 and D 14, consumed more food and significantly outgrew controls by 2 and 1.4 times, respectively, in 105-d experiments. Gross growth efficiency (GGE, fish weight gained/weight of all fish consumed) did not differ among the control and treatment groups over full experimental periods; however, GGE was higher than controls during some refeeding periods in group D14 (i.e., when CG was active). Findings show that the CG response can be exploited in some fishes to cause them to substantially outgrow conspecifics that are fed every day without restriction, with no loss of growth efficiency. Our use of hyperphagia to gauge durations of refeeding periods was critical to achieving growth improvements through CG.

A new approach to quantifying morphological variation in bluegill Lepomis macrochirus
Authors S. P. Gerry, J. Wang,D. J. Ellerby

Abstract
Bluegill Lepomis macrochirus showed intraspecific morphological and behavioural differences dependent on the environment. Pelagic L. macrochirus had more fusiform bodies, a higher pectoral fin aspect ratio, a larger spiny dorsal fin area and pectoral fins located farther from the centre of mass than littoral L. macrochirus (P < 0·05). The shape of the body and pectoral fins, in particular, were suggestive of adaptation for sustained high-speed and economical labriform swimming. Littoral L. macrochirus had a deeper and wider body, deeper caudal fins and wider mouths than pelagic L. macrochirus (P < 0·05). Additionally, the soft dorsal, pelvic, anal and caudal fins of littoral L. macrochirus were positioned farther from the centre of mass (P < 0·05). The size and placement of these fins suggested that they will be effective in creating turning moments to facilitate manoeuvring in the macrophyte-dense littoral habitat.


Group holding impedes compensatory growth of hybrid sunfish
. Robert S Hayward e Ning Wang. Douglas B Noltie

Abstract
An earlier study with a repeating no-feed/refeed schedule (D2 schedule) elicited compensatory growth (CG) in age-0 hybrid sunfish (F1: female green sunfish, Lepomis cyanellus×male bluegill L. macrochirus) held individually and fed ad libitum on feeding days. Weight gain under these conditions exceeded that of daily-fed controls. The present study sought to determine whether similar growth improvement would result when hybrid sunfish were held in groups and fed to satiation on the D2 schedule. In Experiment 1, age-0 hybrid sunfish were held in groups of 10 fish per 25-l chamber at 24°C and fed four times daily to apparent satiation on feeding days. Under this regime, fish fed according to the D2 schedule gained less weight than the controls (P<0.10). Experiment 2 was run in an effort to duplicate the results of the previous study. When age-0 fish were held individually at 24°C and fed ad libitum on feeding days, those fed on the D2 schedule gained significantly more weight (P<0.10) than the controls. These results indicate that group holding in combination with satiation feeding impedes the full expression of the CG capacity of hybrid sunfish. The major impediment under group holding may be the negative effects of social interactions on food consumption and growth efficiency.