. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 140 Calif. Fish and Came 63 (3): 140-156 1977 FECUNDITY AND GROWTH OF THE TULE PERCH, HYSTEROCARPUS TRASKI, IN THE LOWER SACRAMENTO-SAN JOAQUIN DELTA^ GARY LEE BRYANP Bureau of Reclamation Tracy Pumping Plant Tracy, California 95376 Hysterocarpus traski were collected at the Bureau of Reclamation's fish screen near Tracy, California, from September 1972 to November 1973. Additional speci- mens were borrowed from the California Academy
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 140 Calif. Fish and Came 63 (3): 140-156 1977 FECUNDITY AND GROWTH OF THE TULE PERCH, HYSTEROCARPUS TRASKI, IN THE LOWER SACRAMENTO-SAN JOAQUIN DELTA^ GARY LEE BRYANP Bureau of Reclamation Tracy Pumping Plant Tracy, California 95376 Hysterocarpus traski were collected at the Bureau of Reclamation's fish screen near Tracy, California, from September 1972 to November 1973. Additional speci- mens were borrowed from the California Academy of Sciences. The testes and ovaries of 130 fish were examined. Sexual maturation of gonads is cyclic. The males are sexually mature during the breeding season. May to late October. The ova of the females, through the mech- anism of delayed fertilization, are not fertilized until mid-january. Gestation takes months. The average number of young is The young tule perch are not born sexually mature, but reach maturity within a few weeks. A female may be inseminat- ed within weeks of her birth and wilt become pregnant in January. INTRODUCTION The tule perch, Hysterocarpus traski, (Figure 1) are the lone fresh water member of the viviparious surf perch family, Embiotocidae, in the lower Sacra- mento-San Joaquin Delta (Figure 2). Tule perch are relatively scarce in the Delta and especially scarce in the lower (southern) portion of the Delta. This is due to irrigation projects altering and destroying their habitat and to increased com- petition from introduced exotic fish species imported from the eastern United States and Eurasia. Although little information has been published, several MA. icm. Figure 1. Relationship of internal organs within Hysterocarpus traski. (SB, swim bladder; EB, excretory bladder; FB, fat body; GD, gonad; HT, heart; IN, intestine; KD, kidney; LR, liver) ' This paper is based on a thesis written in partial fulfillment of requirements for the degree
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